{"title":"Cusabio Proteins","description":"","products":[{"product_id":"goat-immunoglobulin-g-bhp10506063","title":"Goat Immunoglobulin G","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative goat immunoglobulin G (IgG) is purified from pooled normal goat serum and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Immunoglobulin\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eImmunoglobulin G (IgG) is a Y-shaped antibody composed of two heavy and two light chains, with antigen-binding Fab regions and an Fc region that can engage Fc receptors and complement. IgG is central to humoral immunity and is widely used as a reference reagent for immunoassays, Fc biology studies, and antibody engineering research.\u003c\/p\u003e\u003cp\u003eIgG is a monomeric immunoglobulin, built of two heavy chains gamma and two light chains. Each molecule has two antigen binding sites.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eFc glycosylation and Fc receptor signaling as drivers of antibody effector function and immune modulation.\u003c\/li\u003e \u003cli\u003eAntibody fragmentation and engineering strategies used to dissect antigen binding vs Fc-mediated interactions.\u003c\/li\u003e \u003cli\u003eAssay standardization efforts that use well-defined IgG materials to improve quantitative comparability across platforms.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eCalibration\/controls for immunoassays and secondary antibody workflows where IgG is a common analyte or standard.\u003c\/li\u003e \u003cli\u003eFc receptor and complement engagement studies (conceptual) that separate binding from downstream effector mechanisms.\u003c\/li\u003e \u003cli\u003eBenchmark reagent in antibody purification, formulation, and stability method development.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eGlycosylation patterns on the Fc region can vary by species and source and can influence Fc receptor\/complement interactions.\u003c\/li\u003e \u003cli\u003ePolyclonal IgG preparations represent a mixture of specificities; interpret binding results accordingly.\u003c\/li\u003e \u003cli\u003eFragment formats (Fc\/Fab) change which interactions are possible; align fragment choice to the biology you want to probe.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=immunoglobulin G IgG structure Fc receptor - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=immunoglobulin G IgG structure Fc receptor - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=immunoglobulin G IgG structure Fc receptor%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052972761453,"sku":"CSB-NP002201G-1G","price":1250.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052972794221,"sku":"CSB-NP002201G-100MG","price":250.0,"currency_code":"USD","in_stock":true},{"title":"10 mg","offer_id":53052972826989,"sku":"CSB-NP002201G-10MG","price":100.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052972859757,"sku":"CSB-NP002201G-1MG","price":50.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP002201G-SDS.jpg?v=1772166488"},{"product_id":"human-lactoferrin-bhp10506050","title":"Human lactoferrin","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative human lactoferrin (LTF) is purified from human milk and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Storage Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eLactoferrin is an iron-binding glycoprotein abundant in mucosal secretions and neutrophil granules, often studied for roles in iron sequestration, antimicrobial defense, and immunomodulation. Its iron-binding state and glycosylation can influence interactions with cells and microbes.\u003c\/p\u003e\u003cp\u003eLactoferrin is a glycoprotein present in most human mucosal secretions, including human milk. Lactoferrin is bacteriostatic in low iron media and, in some settings, bactericidal.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eMucosal immunity and microbiome research examining nutrient sequestration and antimicrobial protein networks.\u003c\/li\u003e \u003cli\u003eInflammation biology focusing on neutrophil-driven secreted factors and their downstream signaling effects.\u003c\/li\u003e \u003cli\u003eBiophysical studies of iron-binding proteins and how iron occupancy alters stability and ligand interactions.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eReference reagent in immunoassays or binding studies involving iron-binding glycoproteins.\u003c\/li\u003e \u003cli\u003eHost–microbe interaction studies where iron availability shapes growth and immune responses.\u003c\/li\u003e \u003cli\u003eComparative studies of apo\/holo forms and glycoform-dependent binding behaviors.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eIron saturation (apo vs holo) can change binding and functional interpretations; document iron state when relevant.\u003c\/li\u003e \u003cli\u003eNative lactoferrin may show glycoform heterogeneity dependent on source; this can influence receptor interactions.\u003c\/li\u003e \u003cli\u003eEffects observed in complex matrices can reflect indirect immune signaling; consider orthogonal readouts.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=lactoferrin LTF - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=lactoferrin LTF - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=lactoferrin LTF%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"10 mg","offer_id":53052972695917,"sku":"CSB-NP008701h-10MG","price":3605.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052972728685,"sku":"CSB-NP008701h-1MG","price":450.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP008701h-SDS.jpg?v=1772166488"},{"product_id":"goat-igg-fc-fragment-bhp10506039","title":"Goat IgG Fc fragment","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative goat immunoglobulin G (IgG) is purified from Goat serum IgG digested with papain and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFragment format (Fc):\u003c\/strong\u003e Contains the constant Fc region without antigen-binding domains, enabling Fc-focused studies.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Other Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e fragment crystallizable region\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eImmunoglobulin G (IgG) is a Y-shaped antibody composed of two heavy and two light chains, with antigen-binding Fab regions and an Fc region that can engage Fc receptors and complement. IgG is central to humoral immunity and is widely used as a reference reagent for immunoassays, Fc biology studies, and antibody engineering research.\u003c\/p\u003e\u003cp\u003eThe fragment crystallizable region (Fc region) is the tail region of an antibody that interacts with cell surface receptors called Fc receptors and some proteins of the complement system. This property allows antibodies to activate the immune system.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eFc glycosylation and Fc receptor signaling as drivers of antibody effector function and immune modulation.\u003c\/li\u003e \u003cli\u003eAntibody fragmentation and engineering strategies used to dissect antigen binding vs Fc-mediated interactions.\u003c\/li\u003e \u003cli\u003eAssay standardization efforts that use well-defined IgG materials to improve quantitative comparability across platforms.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eCalibration\/controls for immunoassays and secondary antibody workflows where IgG is a common analyte or standard.\u003c\/li\u003e \u003cli\u003eFc receptor and complement engagement studies (conceptual) that separate binding from downstream effector mechanisms.\u003c\/li\u003e \u003cli\u003eBenchmark reagent in antibody purification, formulation, and stability method development.\u003c\/li\u003e \u003cli\u003eFc receptor\/complement interaction concepts and assay benchmarking where antigen binding is intentionally absent.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eGlycosylation patterns on the Fc region can vary by species and source and can influence Fc receptor\/complement interactions.\u003c\/li\u003e \u003cli\u003ePolyclonal IgG preparations represent a mixture of specificities; interpret binding results accordingly.\u003c\/li\u003e \u003cli\u003eFragment formats (Fc\/Fab) change which interactions are possible; align fragment choice to the biology you want to probe.\u003c\/li\u003e \u003cli\u003eFc fragments lack Fab-mediated antigen binding; observed effects reflect Fc-dependent interactions and solution properties.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=immunoglobulin G IgG structure Fc receptor - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=immunoglobulin G IgG structure Fc receptor - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=immunoglobulin G IgG structure Fc receptor%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"10 mg","offer_id":53052972892525,"sku":"CSB-NP005701G-10MG","price":2000.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052972925293,"sku":"CSB-NP005701G-1MG","price":250.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP005701G-SDS.jpg?v=1772166487"},{"product_id":"mouse-igg-fab-fragment-bhp10506046","title":"Mouse IgG Fab fragment","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative mouse immunoglobulin G (IgG) is purified from Mouse serum IgG digested with papain and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFragment format (Fab):\u003c\/strong\u003e Contains antigen-binding domains without Fc, useful for Fc-independent binding comparisons.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Other Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eImmunoglobulin G (IgG) is a Y-shaped antibody composed of two heavy and two light chains, with antigen-binding Fab regions and an Fc region that can engage Fc receptors and complement. IgG is central to humoral immunity and is widely used as a reference reagent for immunoassays, Fc biology studies, and antibody engineering research.\u003c\/p\u003e\u003cp\u003eThe fragment antigen-binding (Fab fragment) is a region on an antibody that binds to antigens. It is composed of one constant and one variable domain of each of the heavy and the light chain.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eFc glycosylation and Fc receptor signaling as drivers of antibody effector function and immune modulation.\u003c\/li\u003e \u003cli\u003eAntibody fragmentation and engineering strategies used to dissect antigen binding vs Fc-mediated interactions.\u003c\/li\u003e \u003cli\u003eAssay standardization efforts that use well-defined IgG materials to improve quantitative comparability across platforms.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eCalibration\/controls for immunoassays and secondary antibody workflows where IgG is a common analyte or standard.\u003c\/li\u003e \u003cli\u003eFc receptor and complement engagement studies (conceptual) that separate binding from downstream effector mechanisms.\u003c\/li\u003e \u003cli\u003eBenchmark reagent in antibody purification, formulation, and stability method development.\u003c\/li\u003e \u003cli\u003eAntigen-binding comparisons that minimize Fc-mediated effects (e.g., Fc receptor engagement or complement activation).\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eGlycosylation patterns on the Fc region can vary by species and source and can influence Fc receptor\/complement interactions.\u003c\/li\u003e \u003cli\u003ePolyclonal IgG preparations represent a mixture of specificities; interpret binding results accordingly.\u003c\/li\u003e \u003cli\u003eFragment formats (Fc\/Fab) change which interactions are possible; align fragment choice to the biology you want to probe.\u003c\/li\u003e \u003cli\u003eFab fragments lack Fc-mediated interactions; binding behavior may differ from full-length IgG due to avidity and geometry changes.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=immunoglobulin G IgG structure Fc receptor - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=immunoglobulin G IgG structure Fc receptor - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=immunoglobulin G IgG structure Fc receptor%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"10 mg","offer_id":53052972958061,"sku":"CSB-NP005901m-10MG","price":2400.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052972990829,"sku":"CSB-NP005901m-1MG","price":300.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP005901m-SDS.jpg?v=1772166487"},{"product_id":"guinea-pig-serum-albumin-bhp10506085","title":"Guinea pig serum albumin","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative guinea pig serum albumin (ALB) is purified from pooled normal guinea pig serum and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Carrier Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eSerum albumin is the major soluble protein in blood plasma and a key carrier for fatty acids, hormones, metabolites, and many small molecules. Its abundance and broad binding capacity make it widely used as a reference protein in biochemical assays and proteomics, and as a model for studying ligand binding and protein stability.\u003c\/p\u003e\u003cp\u003eSerum albumin, the main protein of plasma, has a good binding capacity for water, Ca(2+), Na(+), K(+), fatty acids, hormones, bilirubin and drugs. Its main function is the regulation of the colloidal osmotic pressure of blood.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eQuantitative proteomics and biomarker work where albumin depletion\/enrichment strategies impact downstream detection.\u003c\/li\u003e \u003cli\u003eProtein–ligand and protein–drug interaction studies, including how oxidative or glycation-related modifications can alter binding.\u003c\/li\u003e \u003cli\u003eAlbumin-based carrier concepts in biomaterials and delivery research (e.g., albumin-binding domains, albumin nanoparticles).\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eReference material for protein quantification (standards\/controls) and method development.\u003c\/li\u003e \u003cli\u003eLigand-binding and stability studies (fatty acids, dyes, small molecules) where albumin’s promiscuous binding is central to interpretation.\u003c\/li\u003e \u003cli\u003eBlocking\/carrier reagent concepts in immunoassay development (interpretation-focused; avoid protocol details).\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eAlbumin can carry endogenous ligands and can exist in multiple modified forms (oxidation, glycation) that may shift binding behavior.\u003c\/li\u003e \u003cli\u003eAlbumin from different species can differ in sequence and ligand affinity; match species to your model system when possible.\u003c\/li\u003e \u003cli\u003eHigh-abundance proteins can mask low-abundance analytes in complex mixtures; consider this when interpreting assay sensitivity.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=serum albumin ALB - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=serum albumin ALB - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=serum albumin ALB%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052973023597,"sku":"CSB-NP002001Gp-1G","price":3000.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052973056365,"sku":"CSB-NP002001Gp-100MG","price":600.0,"currency_code":"USD","in_stock":true},{"title":"10 mg","offer_id":53052973089133,"sku":"CSB-NP002001Gp-10MG","price":200.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052973121901,"sku":"CSB-NP002001Gp-1MG","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP002001Gp-SDS.jpg?v=1772166488"},{"product_id":"bovine-immunoglobulin-g-bhp10506033","title":"Bovine Immunoglobulin G","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative bovine immunoglobulin G (IgG) is purified from Bovine plasma and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Immunoglobulin\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e IgG\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eImmunoglobulin G (IgG) is a Y-shaped antibody composed of two heavy and two light chains, with antigen-binding Fab regions and an Fc region that can engage Fc receptors and complement. IgG is central to humoral immunity and is widely used as a reference reagent for immunoassays, Fc biology studies, and antibody engineering research.\u003c\/p\u003e\u003cp\u003eIgG is a monomeric immunoglobulin, built of two heavy chains gamma and two light chains. Each molecule has two antigen binding sites.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eFc glycosylation and Fc receptor signaling as drivers of antibody effector function and immune modulation.\u003c\/li\u003e \u003cli\u003eAntibody fragmentation and engineering strategies used to dissect antigen binding vs Fc-mediated interactions.\u003c\/li\u003e \u003cli\u003eAssay standardization efforts that use well-defined IgG materials to improve quantitative comparability across platforms.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eCalibration\/controls for immunoassays and secondary antibody workflows where IgG is a common analyte or standard.\u003c\/li\u003e \u003cli\u003eFc receptor and complement engagement studies (conceptual) that separate binding from downstream effector mechanisms.\u003c\/li\u003e \u003cli\u003eBenchmark reagent in antibody purification, formulation, and stability method development.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eGlycosylation patterns on the Fc region can vary by species and source and can influence Fc receptor\/complement interactions.\u003c\/li\u003e \u003cli\u003ePolyclonal IgG preparations represent a mixture of specificities; interpret binding results accordingly.\u003c\/li\u003e \u003cli\u003eFragment formats (Fc\/Fab) change which interactions are possible; align fragment choice to the biology you want to probe.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=immunoglobulin G IgG structure Fc receptor - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=immunoglobulin G IgG structure Fc receptor - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=immunoglobulin G IgG structure Fc receptor%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"10 mg","offer_id":53052973220205,"sku":"CSB-NP008001B-10MG","price":1205.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052973252973,"sku":"CSB-NP008001B-1MG","price":150.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP008001B-SDS.jpg?v=1772166487"},{"product_id":"guinea-pig-hemoglobin-protein-bhp10506682","title":"Guinea Pig Hemoglobin protein","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative guinea pig hemoglobin (HGB) is purified from Guinea Pig erythrocytes and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Binding Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eHemoglobin is a tetrameric heme protein in red blood cells that transports oxygen and carbon dioxide. Cooperative ligand binding and allosteric regulation make hemoglobin a foundational model for studying protein conformational dynamics and redox chemistry.\u003c\/p\u003e\u003cp\u003eInvolved in oxygen transport from the lung to the various peripheral tissues.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eRed blood cell physiology and oxidative stress research linking hemoglobin chemistry to cellular homeostasis.\u003c\/li\u003e \u003cli\u003eBiophysical studies of allostery and cooperative binding as general principles of protein regulation.\u003c\/li\u003e \u003cli\u003eMethod development for hemoglobin quantification and variant\/oxidation-state profiling (RUO).\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eOxygen\/ligand-binding and allostery studies using a classic multi-subunit protein system.\u003c\/li\u003e \u003cli\u003eReference material in analytical assays measuring hemoglobin or heme-protein content.\u003c\/li\u003e \u003cli\u003eRedox and oxidative modification studies (e.g., methemoglobin formation) as interpretable biochemical readouts.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eHemoglobin exists in multiple oxidation and ligand-bound states; these can shift spectra and assay signals.\u003c\/li\u003e \u003cli\u003eSpecies and strain differences can affect sequence and regulatory behavior; match to your model organism.\u003c\/li\u003e \u003cli\u003eIn complex samples, hemolysis and handling can strongly impact apparent hemoglobin measurements.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=hemoglobin HGB - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=hemoglobin HGB - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=hemoglobin HGB%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052973154669,"sku":"CSB-NP004801Gp-1G","price":245.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052973187437,"sku":"CSB-NP004801Gp-100MG","price":30.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP004801Gp-SDS.jpg?v=1772166488"},{"product_id":"rabbit-igg-fc-fragment-bhp10506042","title":"Rabbit IgG Fc fragment","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative rabbit immunoglobulin G (IgG) is purified from Rabbit serum IgG and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFragment format (Fc):\u003c\/strong\u003e Contains the constant Fc region without antigen-binding domains, enabling Fc-focused studies.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Other Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e fragment crystallizable region\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eImmunoglobulin G (IgG) is a Y-shaped antibody composed of two heavy and two light chains, with antigen-binding Fab regions and an Fc region that can engage Fc receptors and complement. IgG is central to humoral immunity and is widely used as a reference reagent for immunoassays, Fc biology studies, and antibody engineering research.\u003c\/p\u003e\u003cp\u003eThe fragment crystallizable region (Fc region) is the tail region of an antibody that interacts with cell surface receptors called Fc receptors and some proteins of the complement system. This property allows antibodies to activate the immune system.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eFc glycosylation and Fc receptor signaling as drivers of antibody effector function and immune modulation.\u003c\/li\u003e \u003cli\u003eAntibody fragmentation and engineering strategies used to dissect antigen binding vs Fc-mediated interactions.\u003c\/li\u003e \u003cli\u003eAssay standardization efforts that use well-defined IgG materials to improve quantitative comparability across platforms.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eCalibration\/controls for immunoassays and secondary antibody workflows where IgG is a common analyte or standard.\u003c\/li\u003e \u003cli\u003eFc receptor and complement engagement studies (conceptual) that separate binding from downstream effector mechanisms.\u003c\/li\u003e \u003cli\u003eBenchmark reagent in antibody purification, formulation, and stability method development.\u003c\/li\u003e \u003cli\u003eFc receptor\/complement interaction concepts and assay benchmarking where antigen binding is intentionally absent.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eGlycosylation patterns on the Fc region can vary by species and source and can influence Fc receptor\/complement interactions.\u003c\/li\u003e \u003cli\u003ePolyclonal IgG preparations represent a mixture of specificities; interpret binding results accordingly.\u003c\/li\u003e \u003cli\u003eFragment formats (Fc\/Fab) change which interactions are possible; align fragment choice to the biology you want to probe.\u003c\/li\u003e \u003cli\u003eFc fragments lack Fab-mediated antigen binding; observed effects reflect Fc-dependent interactions and solution properties.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=immunoglobulin G IgG structure Fc receptor - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=immunoglobulin G IgG structure Fc receptor - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=immunoglobulin G IgG structure Fc receptor%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"10 mg","offer_id":53052973285741,"sku":"CSB-NP005201Rb-10MG","price":2000.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052973318509,"sku":"CSB-NP005201Rb-1MG","price":250.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP005201Rb-SDS.jpg?v=1772166487"},{"product_id":"rabbit-serum-albumin-bhp10506071","title":"Rabbit Serum Albumin","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative rabbit serum albumin (ALB) is purified from Rabbit serum and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Carrier Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eSerum albumin is the major soluble protein in blood plasma and a key carrier for fatty acids, hormones, metabolites, and many small molecules. Its abundance and broad binding capacity make it widely used as a reference protein in biochemical assays and proteomics, and as a model for studying ligand binding and protein stability.\u003c\/p\u003e\u003cp\u003eSerum albumin, the main protein of plasma, has a good binding capacity for water, Ca(2+), Na(+), K(+), fatty acids, hormones, bilirubin and drugs. Its main function is the regulation of the colloidal osmotic pressure of blood.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eQuantitative proteomics and biomarker work where albumin depletion\/enrichment strategies impact downstream detection.\u003c\/li\u003e \u003cli\u003eProtein–ligand and protein–drug interaction studies, including how oxidative or glycation-related modifications can alter binding.\u003c\/li\u003e \u003cli\u003eAlbumin-based carrier concepts in biomaterials and delivery research (e.g., albumin-binding domains, albumin nanoparticles).\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eReference material for protein quantification (standards\/controls) and method development.\u003c\/li\u003e \u003cli\u003eLigand-binding and stability studies (fatty acids, dyes, small molecules) where albumin’s promiscuous binding is central to interpretation.\u003c\/li\u003e \u003cli\u003eBlocking\/carrier reagent concepts in immunoassay development (interpretation-focused; avoid protocol details).\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eAlbumin can carry endogenous ligands and can exist in multiple modified forms (oxidation, glycation) that may shift binding behavior.\u003c\/li\u003e \u003cli\u003eAlbumin from different species can differ in sequence and ligand affinity; match species to your model system when possible.\u003c\/li\u003e \u003cli\u003eHigh-abundance proteins can mask low-abundance analytes in complex mixtures; consider this when interpreting assay sensitivity.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=serum albumin ALB - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=serum albumin ALB - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=serum albumin ALB%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052973351277,"sku":"CSB-NP000701Rb-1G","price":835.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052973384045,"sku":"CSB-NP000701Rb-100MG","price":165.0,"currency_code":"USD","in_stock":true},{"title":"10 mg","offer_id":53052973416813,"sku":"CSB-NP000701Rb-10MG","price":65.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052973449581,"sku":"CSB-NP000701Rb-1MG","price":34.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP000701Rb-SDS.jpg?v=1772166487"},{"product_id":"chicken-yolk-immunoglobulin-bhp10506083","title":"Chicken Yolk Immunoglobulin","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative chicken immunoglobulin Y (IgY) is purified from chicken egg yolk and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Immunoglobulin\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e IgY\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eIgY is the major serum and egg-yolk immunoglobulin in birds and the functional analog of mammalian IgG. Its structural differences from IgG can reduce cross-reactivity with mammalian Fc receptors and complement pathways, which is useful in certain assay designs.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eUse of avian antibodies in immunoassays to reduce interference from mammalian Fc-binding proteins and rheumatoid factor-like effects.\u003c\/li\u003e \u003cli\u003eAntigen-specific IgY generation and purification workflows for RUO applications in immunology and microbiology.\u003c\/li\u003e \u003cli\u003eComparative immunology studies exploring how avian and mammalian antibody systems differ in effector mechanisms.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eReference reagent for assay development where avian vs mammalian immunoglobulin behavior is compared.\u003c\/li\u003e \u003cli\u003eControls in workflows that require an avian immunoglobulin background (e.g., egg-yolk derived materials).\u003c\/li\u003e \u003cli\u003eAnalytical benchmarks for antibody purification and characterization methods.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eIgY does not behave identically to IgG in Fc-dependent interactions; interpret downstream effects accordingly.\u003c\/li\u003e \u003cli\u003eAs with other native immunoglobulins, polyclonality and glycosylation heterogeneity can affect binding readouts.\u003c\/li\u003e \u003cli\u003eMatrix carryover from yolk-derived preparations can influence some assays; use appropriate controls.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=IgY avian immunoglobulin - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=IgY avian immunoglobulin - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=IgY avian immunoglobulin%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052973613421,"sku":"CSB-NP004101C-1G","price":2500.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052973646189,"sku":"CSB-NP004101C-100MG","price":500.0,"currency_code":"USD","in_stock":true},{"title":"10 mg","offer_id":53052973678957,"sku":"CSB-NP004101C-10MG","price":200.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052973711725,"sku":"CSB-NP004101C-1MG","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP004101C-SDS.jpg?v=1772166487"},{"product_id":"goat-serum-albumin-bhp10506075","title":"Goat Serum Albumin","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative goat serum albumin (ALB) is purified from pooled normal goat serum and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Carrier Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eSerum albumin is the major soluble protein in blood plasma and a key carrier for fatty acids, hormones, metabolites, and many small molecules. Its abundance and broad binding capacity make it widely used as a reference protein in biochemical assays and proteomics, and as a model for studying ligand binding and protein stability.\u003c\/p\u003e\u003cp\u003eSerum albumin, the main protein of plasma, has a good binding capacity for water, Ca(2+), Na(+), K(+), fatty acids, hormones, bilirubin and drugs. Its main function is the regulation of the colloidal osmotic pressure of blood.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eQuantitative proteomics and biomarker work where albumin depletion\/enrichment strategies impact downstream detection.\u003c\/li\u003e \u003cli\u003eProtein–ligand and protein–drug interaction studies, including how oxidative or glycation-related modifications can alter binding.\u003c\/li\u003e \u003cli\u003eAlbumin-based carrier concepts in biomaterials and delivery research (e.g., albumin-binding domains, albumin nanoparticles).\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eReference material for protein quantification (standards\/controls) and method development.\u003c\/li\u003e \u003cli\u003eLigand-binding and stability studies (fatty acids, dyes, small molecules) where albumin’s promiscuous binding is central to interpretation.\u003c\/li\u003e \u003cli\u003eBlocking\/carrier reagent concepts in immunoassay development (interpretation-focused; avoid protocol details).\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eAlbumin can carry endogenous ligands and can exist in multiple modified forms (oxidation, glycation) that may shift binding behavior.\u003c\/li\u003e \u003cli\u003eAlbumin from different species can differ in sequence and ligand affinity; match species to your model system when possible.\u003c\/li\u003e \u003cli\u003eHigh-abundance proteins can mask low-abundance analytes in complex mixtures; consider this when interpreting assay sensitivity.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=serum albumin ALB - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=serum albumin ALB - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=serum albumin ALB%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052973482349,"sku":"CSB-NP001801G-1G","price":1885.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052973515117,"sku":"CSB-NP001801G-100MG","price":375.0,"currency_code":"USD","in_stock":true},{"title":"10 mg","offer_id":53052973547885,"sku":"CSB-NP001801G-10MG","price":150.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052973580653,"sku":"CSB-NP001801G-1MG","price":75.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP001801G-SDS.jpg?v=1772166487"},{"product_id":"rabbit-immunoglobulin-g-bhp10506070","title":"Rabbit Immunoglobulin G","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative rabbit immunoglobulin G (IgG) is purified from Rabbit plasma and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Immunoglobulin\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e IgG\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eImmunoglobulin G (IgG) is a Y-shaped antibody composed of two heavy and two light chains, with antigen-binding Fab regions and an Fc region that can engage Fc receptors and complement. IgG is central to humoral immunity and is widely used as a reference reagent for immunoassays, Fc biology studies, and antibody engineering research.\u003c\/p\u003e\u003cp\u003eIgG is a monomeric immunoglobulin, built of two heavy chains gamma and two light chains. Each molecule has two antigen binding sites.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eFc glycosylation and Fc receptor signaling as drivers of antibody effector function and immune modulation.\u003c\/li\u003e \u003cli\u003eAntibody fragmentation and engineering strategies used to dissect antigen binding vs Fc-mediated interactions.\u003c\/li\u003e \u003cli\u003eAssay standardization efforts that use well-defined IgG materials to improve quantitative comparability across platforms.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eCalibration\/controls for immunoassays and secondary antibody workflows where IgG is a common analyte or standard.\u003c\/li\u003e \u003cli\u003eFc receptor and complement engagement studies (conceptual) that separate binding from downstream effector mechanisms.\u003c\/li\u003e \u003cli\u003eBenchmark reagent in antibody purification, formulation, and stability method development.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eGlycosylation patterns on the Fc region can vary by species and source and can influence Fc receptor\/complement interactions.\u003c\/li\u003e \u003cli\u003ePolyclonal IgG preparations represent a mixture of specificities; interpret binding results accordingly.\u003c\/li\u003e \u003cli\u003eFragment formats (Fc\/Fab) change which interactions are possible; align fragment choice to the biology you want to probe.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=immunoglobulin G IgG structure Fc receptor - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=immunoglobulin G IgG structure Fc receptor - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=immunoglobulin G IgG structure Fc receptor%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052973744493,"sku":"CSB-NP001501Rb-1G","price":1250.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052973777261,"sku":"CSB-NP001501Rb-100MG","price":250.0,"currency_code":"USD","in_stock":true},{"title":"10 mg","offer_id":53052973810029,"sku":"CSB-NP001501Rb-10MG","price":100.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052973842797,"sku":"CSB-NP001501Rb-1MG","price":50.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP001501Rb-SDS.jpg?v=1772166488"},{"product_id":"ribulose-1-5-bisphosphate-carboxylase-oxygenase-bhp10506091","title":"Ribulose-1,5-bisphosphate carboxylase oxygenase","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative spinach RuBisCO (ribulose-1,5-bisphosphate carboxylase\/oxygenase) is purified from spinach leaf and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Photosynthetic Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e RuBisCO\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eRibulose-1,5-bisphosphate carboxylase\/oxygenase (RuBisCO) catalyzes the first major step of carbon fixation in the Calvin cycle by converting CO₂ into organic carbon. It also catalyzes a competing oxygenation reaction, linking RuBisCO function to photorespiration and overall photosynthetic efficiency.\u003c\/p\u003e\u003cp\u003eRibulose-1,5-bisphosphate carboxylase oxygenase, most commonly known by the shorter name RuBisCO,is an enzyme involved in the Calvin cycle that catalyzes the first major step of carbon fixation, a process by which the atoms of atmospheric carbon dioxide are made available to organisms in the form of energy-rich molecules such as glucose. RuBisCO catalyzes either the carboxylation or the oxygenation of ribulose-1,5-bisphosphate (also known as RuBP) with carbon dioxide or oxygen.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eEngineering and directed-evolution efforts aimed at improving RuBisCO kinetics or specificity to enhance crop productivity.\u003c\/li\u003e \u003cli\u003eSystems biology of photosynthesis and photorespiration under changing CO₂ and temperature conditions.\u003c\/li\u003e \u003cli\u003eUse of RuBisCO abundance as a normalization anchor in some plant proteomics contexts (RUO).\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eEnzyme and pathway studies focused on carbon fixation and photosynthetic regulation.\u003c\/li\u003e \u003cli\u003eBenchmark protein for plant protein extraction and analytical workflows.\u003c\/li\u003e \u003cli\u003eComparative research on RuBisCO isoforms and organism-specific adaptations.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eRuBisCO activity depends on cofactors and interacting proteins (e.g., chaperones\/activase); isolated protein may not capture full in vivo regulation.\u003c\/li\u003e \u003cli\u003ePreparations from different species can differ in subunit composition and kinetics; align source with your experimental question.\u003c\/li\u003e \u003cli\u003eCarbon-fixation readouts are pathway-level; interpret enzyme-level changes in the context of broader photosynthetic regulation.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=RuBisCO ribulose-1,5-bisphosphate carboxylase oxygenase - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=RuBisCO ribulose-1,5-bisphosphate carboxylase oxygenase - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=RuBisCO ribulose-1,5-bisphosphate carboxylase oxygenase%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"10 mg","offer_id":53052973875565,"sku":"CSB-NP001701Pl-10MG","price":500.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052973908333,"sku":"CSB-NP001701Pl-1MG","price":250.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP001701Pl-SDS.jpg?v=1772166487"},{"product_id":"canine-immunoglobulin-g-bhp10506061","title":"Canine Immunoglobulin G","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative canine immunoglobulin G (IgG) is purified from pooled normal Canine serum and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Immunoglobulin\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e IgG\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eImmunoglobulin G (IgG) is a Y-shaped antibody composed of two heavy and two light chains, with antigen-binding Fab regions and an Fc region that can engage Fc receptors and complement. IgG is central to humoral immunity and is widely used as a reference reagent for immunoassays, Fc biology studies, and antibody engineering research.\u003c\/p\u003e\u003cp\u003eIgG is a monomeric immunoglobulin, built of two heavy chains gamma and two light chains. Each molecule has two antigen binding sites.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eFc glycosylation and Fc receptor signaling as drivers of antibody effector function and immune modulation.\u003c\/li\u003e \u003cli\u003eAntibody fragmentation and engineering strategies used to dissect antigen binding vs Fc-mediated interactions.\u003c\/li\u003e \u003cli\u003eAssay standardization efforts that use well-defined IgG materials to improve quantitative comparability across platforms.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eCalibration\/controls for immunoassays and secondary antibody workflows where IgG is a common analyte or standard.\u003c\/li\u003e \u003cli\u003eFc receptor and complement engagement studies (conceptual) that separate binding from downstream effector mechanisms.\u003c\/li\u003e \u003cli\u003eBenchmark reagent in antibody purification, formulation, and stability method development.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eGlycosylation patterns on the Fc region can vary by species and source and can influence Fc receptor\/complement interactions.\u003c\/li\u003e \u003cli\u003ePolyclonal IgG preparations represent a mixture of specificities; interpret binding results accordingly.\u003c\/li\u003e \u003cli\u003eFragment formats (Fc\/Fab) change which interactions are possible; align fragment choice to the biology you want to probe.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=immunoglobulin G IgG structure Fc receptor - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=immunoglobulin G IgG structure Fc receptor - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=immunoglobulin G IgG structure Fc receptor%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052973941101,"sku":"CSB-NP002701c-1G","price":1250.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052973973869,"sku":"CSB-NP002701c-100MG","price":250.0,"currency_code":"USD","in_stock":true},{"title":"10 mg","offer_id":53052974006637,"sku":"CSB-NP002701c-10MG","price":100.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052974039405,"sku":"CSB-NP002701c-1MG","price":50.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP002701c-SDS.jpg?v=1772166488"},{"product_id":"mouse-immunoglobulin-g2a-bhp10506035","title":"Mouse Immunoglobulin G2a","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative mouse immunoglobulin G2a (IgG2a) is purified from pooled normal mouse serum and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Immunoglobulin\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eImmunoglobulin G (IgG) is a Y-shaped antibody composed of two heavy and two light chains, with antigen-binding Fab regions and an Fc region that can engage Fc receptors and complement. IgG is central to humoral immunity and is widely used as a reference reagent for immunoassays, Fc biology studies, and antibody engineering research. IgG2a denotes a subclass with distinct Fc-mediated effector properties and receptor interactions that can matter in comparative studies.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eFc glycosylation and Fc receptor signaling as drivers of antibody effector function and immune modulation.\u003c\/li\u003e \u003cli\u003eAntibody fragmentation and engineering strategies used to dissect antigen binding vs Fc-mediated interactions.\u003c\/li\u003e \u003cli\u003eAssay standardization efforts that use well-defined IgG materials to improve quantitative comparability across platforms.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eCalibration\/controls for immunoassays and secondary antibody workflows where IgG is a common analyte or standard.\u003c\/li\u003e \u003cli\u003eFc receptor and complement engagement studies (conceptual) that separate binding from downstream effector mechanisms.\u003c\/li\u003e \u003cli\u003eBenchmark reagent in antibody purification, formulation, and stability method development.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eGlycosylation patterns on the Fc region can vary by species and source and can influence Fc receptor\/complement interactions.\u003c\/li\u003e \u003cli\u003ePolyclonal IgG preparations represent a mixture of specificities; interpret binding results accordingly.\u003c\/li\u003e \u003cli\u003eFragment formats (Fc\/Fab) change which interactions are possible; align fragment choice to the biology you want to probe.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=immunoglobulin G IgG structure Fc receptor - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=immunoglobulin G IgG structure Fc receptor - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=immunoglobulin G IgG structure Fc receptor%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"10 mg","offer_id":53052974072173,"sku":"CSB-NP008201m-10MG","price":1205.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052974104941,"sku":"CSB-NP008201m-1MG","price":150.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP008201m-SDS.jpg?v=1772166487"},{"product_id":"rat-transferrin-bhp10506054","title":"Rat Transferrin","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative rat transferrin (TF) is purified from e rat serum. and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Carrier Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;90%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e Serotransferrin,Beta-1 metal-binding globulin,Siderophilin\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eTransferrin is a glycoprotein that binds ferric iron (Fe³⁺) with high affinity and transports it through blood and extracellular fluids. Cellular iron uptake commonly occurs via transferrin receptor–mediated endocytosis, linking transferrin biology to proliferation, metabolism, and stress responses.\u003c\/p\u003e\u003cp\u003eTransferrin is a single polypeptide chain glycoprotein and is a member of the iron binding family of proteins. It has a molecular weight of 77 kDa and a serum concentration range of 1800 to 2700 mg\/L.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eIron homeostasis research intersecting with oxidative stress and ferroptosis, where iron availability and transport pathways are central.\u003c\/li\u003e \u003cli\u003eTransferrin receptor biology in cancer and immune cells as a window into nutrient uptake and activation states.\u003c\/li\u003e \u003cli\u003eGlycosylation and iron-loading state (apo vs holo) as variables influencing binding, trafficking, and assay readouts.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eReceptor-binding and uptake studies to probe transferrin receptor activity in cells and tissues.\u003c\/li\u003e \u003cli\u003eIron-binding\/transfer concepts in biochemical assays, including comparisons of apo- and holo-transferrin behaviors.\u003c\/li\u003e \u003cli\u003eCalibration\/controls for immunoassays and proteomics where transferrin is a common high-abundance plasma protein.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eIron saturation state strongly affects transferrin’s biochemical behavior; interpret results in light of apo\/holo mixtures.\u003c\/li\u003e \u003cli\u003eAs a glycoprotein, transferrin may present glycoform heterogeneity; native preparations can reflect source-dependent variation.\u003c\/li\u003e \u003cli\u003eSpecies differences and plasma-derived co-factors can influence receptor interactions; align the reagent with your experimental model.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=transferrin TF - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=transferrin TF - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=transferrin TF%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"10 mg","offer_id":53052974137709,"sku":"CSB-NP004701r-10MG","price":1495.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052974170477,"sku":"CSB-NP004701r-1MG","price":186.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP004701r-SDS.jpg?v=1772166488"},{"product_id":"chicken-ovotransferrin-bhp10506082","title":"Chicken Ovotransferrin","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative chicken ovotransferrin \/ conalbumin (OVT) is purified from chicken egg white and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Carrier Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e Chicken Ovotransferrin，Allergen Gal d III，Conalbumin，Serum transferrin\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eOvotransferrin (also known as conalbumin) is an egg-white iron-binding glycoprotein related to transferrin. It participates in iron sequestration and is studied in food science and innate defense contexts.\u003c\/p\u003e\u003cp\u003eTransferrins are iron binding transport proteins which can bind two Fe3+ ions in association with the binding of an anion, usually bicarbonate. It is responsible for the transport of iron from sites of absorption and heme degradation to those of storage and utilization.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eFood bioactive protein research exploring iron-binding proteins and derived peptides with antimicrobial properties.\u003c\/li\u003e \u003cli\u003eComparative studies of transferrin-family proteins across species to understand iron-binding and glycosylation effects.\u003c\/li\u003e \u003cli\u003eAnalytical method development for egg protein composition and allergen component profiling.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eIron-binding and ligand interaction studies using a transferrin-family model protein.\u003c\/li\u003e \u003cli\u003eReference protein in egg\/food matrix analytics and proteomics workflows.\u003c\/li\u003e \u003cli\u003eComparative studies of apo\/holo behavior relevant to iron sequestration concepts.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eIron-loading state can influence structure and binding; document conditions when comparing datasets.\u003c\/li\u003e \u003cli\u003eNative glycoforms can vary with source; this may affect receptor or antibody interactions.\u003c\/li\u003e \u003cli\u003eEgg matrices can introduce co-purified proteins; include controls for high-sensitivity assays.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=ovotransferrin conalbumin OVT - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=ovotransferrin conalbumin OVT - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=ovotransferrin conalbumin OVT%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"10 mg","offer_id":53052974203245,"sku":"CSB-NP003901C-10MG","price":1600.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052974236013,"sku":"CSB-NP003901C-1MG","price":200.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP003901C-SDS.jpg?v=1772166487"},{"product_id":"horse-serum-albumin-bhp10506076","title":"Horse Serum Albumin","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative horse serum albumin (ALB) is purified from Horse serum and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Carrier Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eSerum albumin is the major soluble protein in blood plasma and a key carrier for fatty acids, hormones, metabolites, and many small molecules. Its abundance and broad binding capacity make it widely used as a reference protein in biochemical assays and proteomics, and as a model for studying ligand binding and protein stability.\u003c\/p\u003e\u003cp\u003eSerum albumin, the main protein of plasma, has a good binding capacity for water, Ca(2+), Na(+), K(+), fatty acids, hormones, bilirubin and drugs. Its main function is the regulation of the colloidal osmotic pressure of blood.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eQuantitative proteomics and biomarker work where albumin depletion\/enrichment strategies impact downstream detection.\u003c\/li\u003e \u003cli\u003eProtein–ligand and protein–drug interaction studies, including how oxidative or glycation-related modifications can alter binding.\u003c\/li\u003e \u003cli\u003eAlbumin-based carrier concepts in biomaterials and delivery research (e.g., albumin-binding domains, albumin nanoparticles).\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eReference material for protein quantification (standards\/controls) and method development.\u003c\/li\u003e \u003cli\u003eLigand-binding and stability studies (fatty acids, dyes, small molecules) where albumin’s promiscuous binding is central to interpretation.\u003c\/li\u003e \u003cli\u003eBlocking\/carrier reagent concepts in immunoassay development (interpretation-focused; avoid protocol details).\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eAlbumin can carry endogenous ligands and can exist in multiple modified forms (oxidation, glycation) that may shift binding behavior.\u003c\/li\u003e \u003cli\u003eAlbumin from different species can differ in sequence and ligand affinity; match species to your model system when possible.\u003c\/li\u003e \u003cli\u003eHigh-abundance proteins can mask low-abundance analytes in complex mixtures; consider this when interpreting assay sensitivity.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=serum albumin ALB - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=serum albumin ALB - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=serum albumin ALB%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052974268781,"sku":"CSB-NP000401Hs-1G","price":1885.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052974301549,"sku":"CSB-NP000401Hs-100MG","price":375.0,"currency_code":"USD","in_stock":true},{"title":"10 mg","offer_id":53052974334317,"sku":"CSB-NP000401Hs-10MG","price":150.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052974367085,"sku":"CSB-NP000401Hs-1MG","price":75.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP000401Hs-SDS.jpg?v=1772166487"},{"product_id":"ovalbumin-bhp10506122","title":"ovalbumin","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative chicken ovalbumin (OVA) is purified from chicken egg white and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Carrier Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e Allergen Gal d II,Egg albumin,Plakalbumin\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eOvalbumin is the major protein in egg white and a well-established model antigen in immunology. It is also used as a benchmark protein in protein chemistry due to its abundance, stability characteristics, and extensive literature.\u003c\/p\u003e\u003cp\u003eStorage protein of egg white. Lack protease inhibitory activity.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eAntigen presentation and T-cell activation studies using ovalbumin-derived epitopes as standardized model systems.\u003c\/li\u003e \u003cli\u003eAllergy and food immunology research where ovalbumin serves as a reference egg allergen component.\u003c\/li\u003e \u003cli\u003eProtein formulation and stability research leveraging ovalbumin as a tractable globular protein.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eModel antigen in cellular immunology experiments (conceptual) to study antigen processing and immune recognition.\u003c\/li\u003e \u003cli\u003eReference material in allergen-related assay development and analytical method validation.\u003c\/li\u003e \u003cli\u003eBenchmark protein for chromatography, electrophoresis, and proteomics workflows.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eOvalbumin preparations can vary in purity and post-translational modifications; confirm identity for sensitive assays.\u003c\/li\u003e \u003cli\u003eImmune readouts depend on context (adjuvants, routes, cell types); avoid over-interpreting single-marker changes.\u003c\/li\u003e \u003cli\u003eAllergen-related studies are sensitive to trace contaminants; include appropriate negative\/positive controls.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=ovalbumin OVA antigen presentation - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=ovalbumin OVA antigen presentation - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=ovalbumin OVA antigen presentation%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052974399853,"sku":"CSB-NP004301C-1G","price":800.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052974432621,"sku":"CSB-NP004301C-100MG","price":267.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP004301C-SDS.jpg?v=1772166488"},{"product_id":"rabbit-transferrin-bhp10506090","title":"Rabbit Transferrin","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative rabbit transferrin (TF) is purified from Rabbit Serum and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Carrier Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;90%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e Serotransferrin,Beta-1 metal-binding globulin,Siderophilin\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eTransferrin is a glycoprotein that binds ferric iron (Fe³⁺) with high affinity and transports it through blood and extracellular fluids. Cellular iron uptake commonly occurs via transferrin receptor–mediated endocytosis, linking transferrin biology to proliferation, metabolism, and stress responses.\u003c\/p\u003e\u003cp\u003eTransferrins are iron binding transport proteins which can bind two Fe3+ ions in association with the binding of an anion, usually bicarbonate. It is responsible for the transport of iron from sites of absorption and heme degradation to those of storage and utilization.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eIron homeostasis research intersecting with oxidative stress and ferroptosis, where iron availability and transport pathways are central.\u003c\/li\u003e \u003cli\u003eTransferrin receptor biology in cancer and immune cells as a window into nutrient uptake and activation states.\u003c\/li\u003e \u003cli\u003eGlycosylation and iron-loading state (apo vs holo) as variables influencing binding, trafficking, and assay readouts.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eReceptor-binding and uptake studies to probe transferrin receptor activity in cells and tissues.\u003c\/li\u003e \u003cli\u003eIron-binding\/transfer concepts in biochemical assays, including comparisons of apo- and holo-transferrin behaviors.\u003c\/li\u003e \u003cli\u003eCalibration\/controls for immunoassays and proteomics where transferrin is a common high-abundance plasma protein.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eIron saturation state strongly affects transferrin’s biochemical behavior; interpret results in light of apo\/holo mixtures.\u003c\/li\u003e \u003cli\u003eAs a glycoprotein, transferrin may present glycoform heterogeneity; native preparations can reflect source-dependent variation.\u003c\/li\u003e \u003cli\u003eSpecies differences and plasma-derived co-factors can influence receptor interactions; align the reagent with your experimental model.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=transferrin TF - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=transferrin TF - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=transferrin TF%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"10 mg","offer_id":53052974465389,"sku":"CSB-NP003801Rb-10MG","price":1600.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052974498157,"sku":"CSB-NP003801Rb-1MG","price":200.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP003801Rb-SDS.jpg?v=1772166488"},{"product_id":"mouse-immunoglobulin-g-bhp10506066","title":"Mouse Immunoglobulin G","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative mouse immunoglobulin G (IgG) is purified from pooled normal mouse serum and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Immunoglobulin\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eImmunoglobulin G (IgG) is a Y-shaped antibody composed of two heavy and two light chains, with antigen-binding Fab regions and an Fc region that can engage Fc receptors and complement. IgG is central to humoral immunity and is widely used as a reference reagent for immunoassays, Fc biology studies, and antibody engineering research.\u003c\/p\u003e\u003cp\u003eIgG is a monomeric immunoglobulin, built of two heavy chains gamma and two light chains. Each molecule has two antigen binding sites.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eFc glycosylation and Fc receptor signaling as drivers of antibody effector function and immune modulation.\u003c\/li\u003e \u003cli\u003eAntibody fragmentation and engineering strategies used to dissect antigen binding vs Fc-mediated interactions.\u003c\/li\u003e \u003cli\u003eAssay standardization efforts that use well-defined IgG materials to improve quantitative comparability across platforms.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eCalibration\/controls for immunoassays and secondary antibody workflows where IgG is a common analyte or standard.\u003c\/li\u003e \u003cli\u003eFc receptor and complement engagement studies (conceptual) that separate binding from downstream effector mechanisms.\u003c\/li\u003e \u003cli\u003eBenchmark reagent in antibody purification, formulation, and stability method development.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eGlycosylation patterns on the Fc region can vary by species and source and can influence Fc receptor\/complement interactions.\u003c\/li\u003e \u003cli\u003ePolyclonal IgG preparations represent a mixture of specificities; interpret binding results accordingly.\u003c\/li\u003e \u003cli\u003eFragment formats (Fc\/Fab) change which interactions are possible; align fragment choice to the biology you want to probe.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=immunoglobulin G IgG structure Fc receptor - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=immunoglobulin G IgG structure Fc receptor - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=immunoglobulin G IgG structure Fc receptor%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052974661997,"sku":"CSB-NP001601m-1G","price":1250.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052974694765,"sku":"CSB-NP001601m-100MG","price":250.0,"currency_code":"USD","in_stock":true},{"title":"10 mg","offer_id":53052974727533,"sku":"CSB-NP001601m-10MG","price":100.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052974760301,"sku":"CSB-NP001601m-1MG","price":50.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP001601m-SDS.jpg?v=1772166488"},{"product_id":"rat-serum-albumin-bhp10506073","title":"Rat Serum Albumin","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative rat serum albumin (ALB) is purified from Rat serum and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Carrier Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eSerum albumin is the major soluble protein in blood plasma and a key carrier for fatty acids, hormones, metabolites, and many small molecules. Its abundance and broad binding capacity make it widely used as a reference protein in biochemical assays and proteomics, and as a model for studying ligand binding and protein stability.\u003c\/p\u003e\u003cp\u003eSerum albumin, the main protein of plasma, has a good binding capacity for water, Ca(2+), Na(+), K(+), fatty acids, hormones, bilirubin and drugs. Its main function is the regulation of the colloidal osmotic pressure of blood.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eQuantitative proteomics and biomarker work where albumin depletion\/enrichment strategies impact downstream detection.\u003c\/li\u003e \u003cli\u003eProtein–ligand and protein–drug interaction studies, including how oxidative or glycation-related modifications can alter binding.\u003c\/li\u003e \u003cli\u003eAlbumin-based carrier concepts in biomaterials and delivery research (e.g., albumin-binding domains, albumin nanoparticles).\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eReference material for protein quantification (standards\/controls) and method development.\u003c\/li\u003e \u003cli\u003eLigand-binding and stability studies (fatty acids, dyes, small molecules) where albumin’s promiscuous binding is central to interpretation.\u003c\/li\u003e \u003cli\u003eBlocking\/carrier reagent concepts in immunoassay development (interpretation-focused; avoid protocol details).\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eAlbumin can carry endogenous ligands and can exist in multiple modified forms (oxidation, glycation) that may shift binding behavior.\u003c\/li\u003e \u003cli\u003eAlbumin from different species can differ in sequence and ligand affinity; match species to your model system when possible.\u003c\/li\u003e \u003cli\u003eHigh-abundance proteins can mask low-abundance analytes in complex mixtures; consider this when interpreting assay sensitivity.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=serum albumin ALB - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=serum albumin ALB - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=serum albumin ALB%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052974530925,"sku":"CSB-NP000101r-1G","price":2665.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052974563693,"sku":"CSB-NP000101r-100MG","price":535.0,"currency_code":"USD","in_stock":true},{"title":"10 mg","offer_id":53052974596461,"sku":"CSB-NP000101r-10MG","price":100.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052974629229,"sku":"CSB-NP000101r-1MG","price":50.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP000101r-SDS.jpg?v=1772166487"},{"product_id":"chicken-serum-albumin-bhp10506062","title":"Chicken Serum Albumin","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative chicken serum albumin (ALB) is purified from Chicken serum and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Carrier Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eSerum albumin is the major soluble protein in blood plasma and a key carrier for fatty acids, hormones, metabolites, and many small molecules. Its abundance and broad binding capacity make it widely used as a reference protein in biochemical assays and proteomics, and as a model for studying ligand binding and protein stability.\u003c\/p\u003e\u003cp\u003eSerum albumin, the main protein of plasma, has a good binding capacity for water, Ca(2+), Na(+), K(+), fatty acids, hormones, bilirubin and drugs. Its main function is the regulation of the colloidal osmotic pressure of blood.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eQuantitative proteomics and biomarker work where albumin depletion\/enrichment strategies impact downstream detection.\u003c\/li\u003e \u003cli\u003eProtein–ligand and protein–drug interaction studies, including how oxidative or glycation-related modifications can alter binding.\u003c\/li\u003e \u003cli\u003eAlbumin-based carrier concepts in biomaterials and delivery research (e.g., albumin-binding domains, albumin nanoparticles).\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eReference material for protein quantification (standards\/controls) and method development.\u003c\/li\u003e \u003cli\u003eLigand-binding and stability studies (fatty acids, dyes, small molecules) where albumin’s promiscuous binding is central to interpretation.\u003c\/li\u003e \u003cli\u003eBlocking\/carrier reagent concepts in immunoassay development (interpretation-focused; avoid protocol details).\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eAlbumin can carry endogenous ligands and can exist in multiple modified forms (oxidation, glycation) that may shift binding behavior.\u003c\/li\u003e \u003cli\u003eAlbumin from different species can differ in sequence and ligand affinity; match species to your model system when possible.\u003c\/li\u003e \u003cli\u003eHigh-abundance proteins can mask low-abundance analytes in complex mixtures; consider this when interpreting assay sensitivity.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=serum albumin ALB - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=serum albumin ALB - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=serum albumin ALB%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052974793069,"sku":"CSB-NP000301C-1G","price":625.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052974825837,"sku":"CSB-NP000301C-100MG","price":250.0,"currency_code":"USD","in_stock":true},{"title":"10 mg","offer_id":53052974858605,"sku":"CSB-NP000301C-10MG","price":100.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052974891373,"sku":"CSB-NP000301C-1MG","price":50.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP000301C-SDS.jpg?v=1772166487"},{"product_id":"sheep-serum-albumin-bhp10506078","title":"Sheep Serum Albumin","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative sheep serum albumin (ALB) is purified from Sheep serum and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Carrier Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eSerum albumin is the major soluble protein in blood plasma and a key carrier for fatty acids, hormones, metabolites, and many small molecules. Its abundance and broad binding capacity make it widely used as a reference protein in biochemical assays and proteomics, and as a model for studying ligand binding and protein stability.\u003c\/p\u003e\u003cp\u003eSerum albumin, the main protein of plasma, has a good binding capacity for water, Ca(2+), Na(+), K(+), fatty acids, hormones, bilirubin and drugs. Its main function is the regulation of the colloidal osmotic pressure of blood.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eQuantitative proteomics and biomarker work where albumin depletion\/enrichment strategies impact downstream detection.\u003c\/li\u003e \u003cli\u003eProtein–ligand and protein–drug interaction studies, including how oxidative or glycation-related modifications can alter binding.\u003c\/li\u003e \u003cli\u003eAlbumin-based carrier concepts in biomaterials and delivery research (e.g., albumin-binding domains, albumin nanoparticles).\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eReference material for protein quantification (standards\/controls) and method development.\u003c\/li\u003e \u003cli\u003eLigand-binding and stability studies (fatty acids, dyes, small molecules) where albumin’s promiscuous binding is central to interpretation.\u003c\/li\u003e \u003cli\u003eBlocking\/carrier reagent concepts in immunoassay development (interpretation-focused; avoid protocol details).\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eAlbumin can carry endogenous ligands and can exist in multiple modified forms (oxidation, glycation) that may shift binding behavior.\u003c\/li\u003e \u003cli\u003eAlbumin from different species can differ in sequence and ligand affinity; match species to your model system when possible.\u003c\/li\u003e \u003cli\u003eHigh-abundance proteins can mask low-abundance analytes in complex mixtures; consider this when interpreting assay sensitivity.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=serum albumin ALB - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=serum albumin ALB - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=serum albumin ALB%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052974924141,"sku":"CSB-NP000501Sh-1G","price":1885.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052974956909,"sku":"CSB-NP000501Sh-100MG","price":375.0,"currency_code":"USD","in_stock":true},{"title":"10 mg","offer_id":53052974989677,"sku":"CSB-NP000501Sh-10MG","price":150.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052975022445,"sku":"CSB-NP000501Sh-1MG","price":75.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP000501Sh-SDS.jpg?v=1772166487"},{"product_id":"rat-igg-fab-fragment-bhp10506048","title":"Rat IgG Fab fragment","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative rat immunoglobulin G (IgG) is purified from Rat serum IgG digested with papain and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFragment format (Fab):\u003c\/strong\u003e Contains antigen-binding domains without Fc, useful for Fc-independent binding comparisons.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Other Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e fragment antigen-binding\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eImmunoglobulin G (IgG) is a Y-shaped antibody composed of two heavy and two light chains, with antigen-binding Fab regions and an Fc region that can engage Fc receptors and complement. IgG is central to humoral immunity and is widely used as a reference reagent for immunoassays, Fc biology studies, and antibody engineering research.\u003c\/p\u003e\u003cp\u003eThe fragment antigen-binding (Fab fragment) is a region on an antibody that binds to antigens. It is composed of one constant and one variable domain of each of the heavy and the light chain.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eFc glycosylation and Fc receptor signaling as drivers of antibody effector function and immune modulation.\u003c\/li\u003e \u003cli\u003eAntibody fragmentation and engineering strategies used to dissect antigen binding vs Fc-mediated interactions.\u003c\/li\u003e \u003cli\u003eAssay standardization efforts that use well-defined IgG materials to improve quantitative comparability across platforms.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eCalibration\/controls for immunoassays and secondary antibody workflows where IgG is a common analyte or standard.\u003c\/li\u003e \u003cli\u003eFc receptor and complement engagement studies (conceptual) that separate binding from downstream effector mechanisms.\u003c\/li\u003e \u003cli\u003eBenchmark reagent in antibody purification, formulation, and stability method development.\u003c\/li\u003e \u003cli\u003eAntigen-binding comparisons that minimize Fc-mediated effects (e.g., Fc receptor engagement or complement activation).\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eGlycosylation patterns on the Fc region can vary by species and source and can influence Fc receptor\/complement interactions.\u003c\/li\u003e \u003cli\u003ePolyclonal IgG preparations represent a mixture of specificities; interpret binding results accordingly.\u003c\/li\u003e \u003cli\u003eFragment formats (Fc\/Fab) change which interactions are possible; align fragment choice to the biology you want to probe.\u003c\/li\u003e \u003cli\u003eFab fragments lack Fc-mediated interactions; binding behavior may differ from full-length IgG due to avidity and geometry changes.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=immunoglobulin G IgG structure Fc receptor - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=immunoglobulin G IgG structure Fc receptor - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=immunoglobulin G IgG structure Fc receptor%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"10 mg","offer_id":53052975055213,"sku":"CSB-NP006901r-10MG","price":2400.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052975087981,"sku":"CSB-NP006901r-1MG","price":300.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP006901r-SDS.jpg?v=1772166487"},{"product_id":"human-casein-bhp10506049","title":"Human casein","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative human casein (CSN) is purified from human milk and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Storage Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eCaseins are a family of milk proteins characterized by relatively flexible, proline-rich sequences and extensive phosphorylation. They assemble into micellar structures with calcium phosphate, making them central to milk biology and widely studied in food science and biomaterials contexts.\u003c\/p\u003e\u003cp\u003eCasein contains a fairly high number of proline residues, which do not interact. There are also no disulfide bridges.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eMilk protein self-assembly and micelle structure research using advanced imaging and scattering approaches.\u003c\/li\u003e \u003cli\u003eBioactive peptide generation and functional ingredient research (RUO) that examines digestion-derived casein peptides.\u003c\/li\u003e \u003cli\u003eUse of casein-based materials (nanoparticles, films) as model soft-matter systems in delivery and formulation research.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eReference protein for studying intrinsically disordered or flexible protein behavior and calcium-dependent assembly.\u003c\/li\u003e \u003cli\u003eFood matrix analytics and method development where casein composition affects processing outcomes.\u003c\/li\u003e \u003cli\u003eBiomaterials research using casein as a biopolymer component.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eCasein preparations can include multiple isoforms and phosphorylation states; these may affect aggregation and binding.\u003c\/li\u003e \u003cli\u003eCalcium and ionic strength strongly influence micelle-like behavior; interpret assays with attention to buffer composition.\u003c\/li\u003e \u003cli\u003eBecause caseins are heterogeneous, quantitative comparisons benefit from well-defined standards and orthogonal characterization.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=casein CSN milk micelle - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=casein CSN milk micelle - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=casein CSN milk micelle%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"10 mg","offer_id":53052975186285,"sku":"CSB-NP008801h-10MG","price":3605.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052975219053,"sku":"CSB-NP008801h-1MG","price":450.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP008801h-SDS.jpg?v=1772166488"},{"product_id":"human-igg-fab-fragment-bhp10506045","title":"Human IgG Fab fragment","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative human immunoglobulin G (IgG) is purified from Human serum IgG and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFragment format (Fab):\u003c\/strong\u003e Contains antigen-binding domains without Fc, useful for Fc-independent binding comparisons.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Other Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e fragment antigen-binding\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eImmunoglobulin G (IgG) is a Y-shaped antibody composed of two heavy and two light chains, with antigen-binding Fab regions and an Fc region that can engage Fc receptors and complement. IgG is central to humoral immunity and is widely used as a reference reagent for immunoassays, Fc biology studies, and antibody engineering research.\u003c\/p\u003e\u003cp\u003eThe fragment antigen-binding (Fab fragment) is a region on an antibody that binds to antigens. It is composed of one constant and one variable domain of each of the heavy and the light chain.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eFc glycosylation and Fc receptor signaling as drivers of antibody effector function and immune modulation.\u003c\/li\u003e \u003cli\u003eAntibody fragmentation and engineering strategies used to dissect antigen binding vs Fc-mediated interactions.\u003c\/li\u003e \u003cli\u003eAssay standardization efforts that use well-defined IgG materials to improve quantitative comparability across platforms.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eCalibration\/controls for immunoassays and secondary antibody workflows where IgG is a common analyte or standard.\u003c\/li\u003e \u003cli\u003eFc receptor and complement engagement studies (conceptual) that separate binding from downstream effector mechanisms.\u003c\/li\u003e \u003cli\u003eBenchmark reagent in antibody purification, formulation, and stability method development.\u003c\/li\u003e \u003cli\u003eAntigen-binding comparisons that minimize Fc-mediated effects (e.g., Fc receptor engagement or complement activation).\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eGlycosylation patterns on the Fc region can vary by species and source and can influence Fc receptor\/complement interactions.\u003c\/li\u003e \u003cli\u003ePolyclonal IgG preparations represent a mixture of specificities; interpret binding results accordingly.\u003c\/li\u003e \u003cli\u003eFragment formats (Fc\/Fab) change which interactions are possible; align fragment choice to the biology you want to probe.\u003c\/li\u003e \u003cli\u003eFab fragments lack Fc-mediated interactions; binding behavior may differ from full-length IgG due to avidity and geometry changes.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=immunoglobulin G IgG structure Fc receptor - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=immunoglobulin G IgG structure Fc receptor - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=immunoglobulin G IgG structure Fc receptor%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"10 mg","offer_id":53052975120749,"sku":"CSB-NP005301h-10MG","price":2400.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052975153517,"sku":"CSB-NP005301h-1MG","price":300.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP005301h-SDS.jpg?v=1772166487"},{"product_id":"human-neutrophil-gelatinase-associated-lipocalin-protein-bhp10506058","title":"human Neutrophil gelatinase-associated lipocalin protein","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative human lipocalin-2 \/ NGAL (LCN2) is purified from human urine and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Other Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eLipocalin-2 (LCN2), also known as neutrophil gelatinase-associated lipocalin (NGAL), is a secreted lipocalin involved in innate immune responses and iron trafficking through siderophore binding. It is produced by multiple cell types and is frequently studied in inflammation and epithelial stress contexts.\u003c\/p\u003e\u003cp\u003eIron-trafficking protein involved in multiple processes such as apoptosis, innate immunity and renal development. Binds iron through association with 2,5-dihydroxybenzoic acid (2,5-DHBA), a siderophore that shares structural similarities with bacterial enterobactin, and delivers or removes iron from the cell, depending on the context.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eInnate immunity and host–microbe interactions where siderophore sequestration links nutrition to pathogen control.\u003c\/li\u003e \u003cli\u003eRenal and epithelial injury models where LCN2\/NGAL is frequently profiled as a responsive secreted factor (RUO).\u003c\/li\u003e \u003cli\u003eMetabolic inflammation research examining LCN2 as a mediator or marker in adipose and systemic inflammatory signaling.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eImmunoassay standards\/controls for LCN2 quantification in cell culture supernatants or biological matrices.\u003c\/li\u003e \u003cli\u003eBinding and mechanistic studies around siderophore\/iron handling and receptor-mediated uptake concepts.\u003c\/li\u003e \u003cli\u003ePathway studies connecting inflammatory cytokines, epithelial stress, and secreted protein programs.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eLCN2 can exist in different ligand-bound states; ligand occupancy may influence functional interpretations.\u003c\/li\u003e \u003cli\u003eMatrix effects (serum, urine, mucosal fluids) can change apparent measurements; interpret with appropriate controls.\u003c\/li\u003e \u003cli\u003eReported biology can be tissue- and context-specific; avoid over-interpreting changes without complementary markers.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=lipocalin-2 LCN2 NGAL - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=lipocalin-2 LCN2 NGAL - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=lipocalin-2 LCN2 NGAL%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052975513965,"sku":"CSB-NP068341h-1G","price":173335.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052975546733,"sku":"CSB-NP068341h-100MG","price":26665.0,"currency_code":"USD","in_stock":true},{"title":"10 mg","offer_id":53052975579501,"sku":"CSB-NP068341h-10MG","price":3335.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052975612269,"sku":"CSB-NP068341h-1MG","price":630.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP068341h-SDS.jpg?v=1772166487"},{"product_id":"canine-serum-albumin-bhp10506080","title":"Canine Serum Albumin","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative canine serum albumin (ALB) is purified from pooled normal Canine serum and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Carrier Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eSerum albumin is the major soluble protein in blood plasma and a key carrier for fatty acids, hormones, metabolites, and many small molecules. Its abundance and broad binding capacity make it widely used as a reference protein in biochemical assays and proteomics, and as a model for studying ligand binding and protein stability.\u003c\/p\u003e\u003cp\u003eSerum albumin, the main protein of plasma, has a good binding capacity for water, Ca(2+), Na(+), K(+), fatty acids, hormones, bilirubin and drugs. Its main function is the regulation of the colloidal osmotic pressure of blood.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eQuantitative proteomics and biomarker work where albumin depletion\/enrichment strategies impact downstream detection.\u003c\/li\u003e \u003cli\u003eProtein–ligand and protein–drug interaction studies, including how oxidative or glycation-related modifications can alter binding.\u003c\/li\u003e \u003cli\u003eAlbumin-based carrier concepts in biomaterials and delivery research (e.g., albumin-binding domains, albumin nanoparticles).\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eReference material for protein quantification (standards\/controls) and method development.\u003c\/li\u003e \u003cli\u003eLigand-binding and stability studies (fatty acids, dyes, small molecules) where albumin’s promiscuous binding is central to interpretation.\u003c\/li\u003e \u003cli\u003eBlocking\/carrier reagent concepts in immunoassay development (interpretation-focused; avoid protocol details).\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eAlbumin can carry endogenous ligands and can exist in multiple modified forms (oxidation, glycation) that may shift binding behavior.\u003c\/li\u003e \u003cli\u003eAlbumin from different species can differ in sequence and ligand affinity; match species to your model system when possible.\u003c\/li\u003e \u003cli\u003eHigh-abundance proteins can mask low-abundance analytes in complex mixtures; consider this when interpreting assay sensitivity.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=serum albumin ALB - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=serum albumin ALB - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=serum albumin ALB%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052975251821,"sku":"CSB-NP002601c-1G","price":2500.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052975284589,"sku":"CSB-NP002601c-100MG","price":500.0,"currency_code":"USD","in_stock":true},{"title":"10 mg","offer_id":53052975317357,"sku":"CSB-NP002601c-10MG","price":200.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052975350125,"sku":"CSB-NP002601c-1MG","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP002601c-SDS.jpg?v=1772166487"},{"product_id":"rat-immunoglobulin-g-bhp10506072","title":"Rat Immunoglobulin G","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative rat immunoglobulin G (IgG) is purified from pooled normal rat serum and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Immunoglobulin\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eImmunoglobulin G (IgG) is a Y-shaped antibody composed of two heavy and two light chains, with antigen-binding Fab regions and an Fc region that can engage Fc receptors and complement. IgG is central to humoral immunity and is widely used as a reference reagent for immunoassays, Fc biology studies, and antibody engineering research.\u003c\/p\u003e\u003cp\u003eIgG is a monomeric immunoglobulin, built of two heavy chains gamma and two light chains. Each molecule has two antigen binding sites.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eFc glycosylation and Fc receptor signaling as drivers of antibody effector function and immune modulation.\u003c\/li\u003e \u003cli\u003eAntibody fragmentation and engineering strategies used to dissect antigen binding vs Fc-mediated interactions.\u003c\/li\u003e \u003cli\u003eAssay standardization efforts that use well-defined IgG materials to improve quantitative comparability across platforms.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eCalibration\/controls for immunoassays and secondary antibody workflows where IgG is a common analyte or standard.\u003c\/li\u003e \u003cli\u003eFc receptor and complement engagement studies (conceptual) that separate binding from downstream effector mechanisms.\u003c\/li\u003e \u003cli\u003eBenchmark reagent in antibody purification, formulation, and stability method development.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eGlycosylation patterns on the Fc region can vary by species and source and can influence Fc receptor\/complement interactions.\u003c\/li\u003e \u003cli\u003ePolyclonal IgG preparations represent a mixture of specificities; interpret binding results accordingly.\u003c\/li\u003e \u003cli\u003eFragment formats (Fc\/Fab) change which interactions are possible; align fragment choice to the biology you want to probe.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=immunoglobulin G IgG structure Fc receptor - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=immunoglobulin G IgG structure Fc receptor - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=immunoglobulin G IgG structure Fc receptor%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052975382893,"sku":"CSB-NP002301r-1G","price":1250.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052975415661,"sku":"CSB-NP002301r-100MG","price":250.0,"currency_code":"USD","in_stock":true},{"title":"10 mg","offer_id":53052975448429,"sku":"CSB-NP002301r-10MG","price":100.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052975481197,"sku":"CSB-NP002301r-1MG","price":50.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP002301r-SDS.jpg?v=1772166488"},{"product_id":"sheep-transferrin-bhp10506051","title":"Sheep transferrin","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative sheep transferrin (TF) is purified from sheep serum and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Carrier Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eTransferrin is a glycoprotein that binds ferric iron (Fe³⁺) with high affinity and transports it through blood and extracellular fluids. Cellular iron uptake commonly occurs via transferrin receptor–mediated endocytosis, linking transferrin biology to proliferation, metabolism, and stress responses.\u003c\/p\u003e\u003cp\u003eTransferrin concentration and total iron binding capacity (TIBC) are currently used to assess iron status. Although correlation between TIBC and transferrin is generally considered as good, conversion factors between the two analytes found in literature show large differences.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eIron homeostasis research intersecting with oxidative stress and ferroptosis, where iron availability and transport pathways are central.\u003c\/li\u003e \u003cli\u003eTransferrin receptor biology in cancer and immune cells as a window into nutrient uptake and activation states.\u003c\/li\u003e \u003cli\u003eGlycosylation and iron-loading state (apo vs holo) as variables influencing binding, trafficking, and assay readouts.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eReceptor-binding and uptake studies to probe transferrin receptor activity in cells and tissues.\u003c\/li\u003e \u003cli\u003eIron-binding\/transfer concepts in biochemical assays, including comparisons of apo- and holo-transferrin behaviors.\u003c\/li\u003e \u003cli\u003eCalibration\/controls for immunoassays and proteomics where transferrin is a common high-abundance plasma protein.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eIron saturation state strongly affects transferrin’s biochemical behavior; interpret results in light of apo\/holo mixtures.\u003c\/li\u003e \u003cli\u003eAs a glycoprotein, transferrin may present glycoform heterogeneity; native preparations can reflect source-dependent variation.\u003c\/li\u003e \u003cli\u003eSpecies differences and plasma-derived co-factors can influence receptor interactions; align the reagent with your experimental model.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=transferrin TF - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=transferrin TF - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=transferrin TF%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"10 mg","offer_id":53052975645037,"sku":"CSB-NP008601sh-10MG","price":3605.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052975677805,"sku":"CSB-NP008601sh-1MG","price":450.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP008601sh-SDS.jpg?v=1772166487"},{"product_id":"human-serum-albumin-bhp10506086","title":"Human Serum Albumin","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative human serum albumin (ALB) is purified from Human serum and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Carrier Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eSerum albumin is the major soluble protein in blood plasma and a key carrier for fatty acids, hormones, metabolites, and many small molecules. Its abundance and broad binding capacity make it widely used as a reference protein in biochemical assays and proteomics, and as a model for studying ligand binding and protein stability.\u003c\/p\u003e\u003cp\u003eSerum albumin, the main protein of plasma, has a good binding capacity for water, Ca(2+), Na(+), K(+), fatty acids, hormones, bilirubin and drugs. Its main function is the regulation of the colloidal osmotic pressure of blood.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eQuantitative proteomics and biomarker work where albumin depletion\/enrichment strategies impact downstream detection.\u003c\/li\u003e \u003cli\u003eProtein–ligand and protein–drug interaction studies, including how oxidative or glycation-related modifications can alter binding.\u003c\/li\u003e \u003cli\u003eAlbumin-based carrier concepts in biomaterials and delivery research (e.g., albumin-binding domains, albumin nanoparticles).\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eReference material for protein quantification (standards\/controls) and method development.\u003c\/li\u003e \u003cli\u003eLigand-binding and stability studies (fatty acids, dyes, small molecules) where albumin’s promiscuous binding is central to interpretation.\u003c\/li\u003e \u003cli\u003eBlocking\/carrier reagent concepts in immunoassay development (interpretation-focused; avoid protocol details).\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eAlbumin can carry endogenous ligands and can exist in multiple modified forms (oxidation, glycation) that may shift binding behavior.\u003c\/li\u003e \u003cli\u003eAlbumin from different species can differ in sequence and ligand affinity; match species to your model system when possible.\u003c\/li\u003e \u003cli\u003eHigh-abundance proteins can mask low-abundance analytes in complex mixtures; consider this when interpreting assay sensitivity.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=serum albumin ALB - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=serum albumin ALB - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=serum albumin ALB%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052975710573,"sku":"CSB-NP000601h-1G","price":1885.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052975743341,"sku":"CSB-NP000601h-100MG","price":375.0,"currency_code":"USD","in_stock":true},{"title":"10 mg","offer_id":53052975776109,"sku":"CSB-NP000601h-10MG","price":150.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052975808877,"sku":"CSB-NP000601h-1MG","price":75.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP000601h-SDS.jpg?v=1772166487"},{"product_id":"human-cystatin-c-protein-bhp10506056","title":"human Cystatin-C protein","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative human cystatin C (CST3) is purified from human urine and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Other Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eCystatin C (CST3) is a secreted cysteine protease inhibitor that regulates extracellular and lysosomal protease activity. It is broadly expressed and has been extensively studied in the context of protease balance, tissue remodeling, and inflammatory signaling.\u003c\/p\u003e\u003cp\u003eAs an inhibitor of cysteine proteinases, this protein is thought to serve an important physiological role as a local regulator of this enzyme activity. Expressed in submandibular and sublingual saliva but not in parotid saliva (at protein level).\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eProtease–antiprotease balance studies in inflammation and tissue remodeling, including cathepsin pathway regulation.\u003c\/li\u003e \u003cli\u003eSystems biology approaches that use cystatin C as a context marker in renal physiology and protein turnover research (RUO).\u003c\/li\u003e \u003cli\u003eNeuroinflammation and neurodegeneration research exploring extracellular proteostasis and protease regulation.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eStandards\/controls for immunoassays that quantify cystatin C in biological matrices.\u003c\/li\u003e \u003cli\u003eBiochemical inhibition studies of cysteine proteases (conceptual; no protocol steps).\u003c\/li\u003e \u003cli\u003eMechanistic work linking protease activity to extracellular matrix remodeling and signaling.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eProtease inhibition readouts can be influenced by pH, redox state, and competing substrates; interpret in context.\u003c\/li\u003e \u003cli\u003eCystatin C is secreted and can associate with extracellular compartments; sample handling and matrix choice affect measurements.\u003c\/li\u003e \u003cli\u003eSpecies differences and isoforms can affect antibody recognition; match reagent\/species to your assay design.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=cystatin C CST3 - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=cystatin C CST3 - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=cystatin C CST3%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052975841645,"sku":"CSB-NP061941h-1G","price":266665.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052975874413,"sku":"CSB-NP061941h-100MG","price":34665.0,"currency_code":"USD","in_stock":true},{"title":"10 mg","offer_id":53052975907181,"sku":"CSB-NP061941h-10MG","price":4665.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052975939949,"sku":"CSB-NP061941h-1MG","price":630.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP061941h-SDS.jpg?v=1772166487"},{"product_id":"immobilized-papain-bhp10506620","title":"Immobilized Papain","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative papaya papain (PAP) is purified from papaya latex and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Attacin\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003ePapain is a plant-derived cysteine protease widely used as a model endopeptidase and as a tool enzyme in protein processing. In antibody research, papain is commonly used to generate Fab and Fc fragments by cleaving in the hinge region, enabling separation of antigen-binding and Fc-mediated functions. An immobilized format can simplify enzyme removal from reaction mixtures and support cleaner downstream analysis.\u003c\/p\u003e\u003cp\u003ePapain is a nonspecific, cysteine-endopeptidase isolated from papaya latex that is used in a wide variety of applications.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eAntibody engineering and characterization workflows that compare full-length antibodies with fragment formats.\u003c\/li\u003e \u003cli\u003eMethod development for controlled proteolysis and fragment mapping in protein analytics (RUO).\u003c\/li\u003e \u003cli\u003eImmobilized-enzyme formats in bioprocessing and analytical sample prep to improve reproducibility and cleanup.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eConceptual use in antibody fragmentation studies (Fab vs Fc functional dissection) without prescribing specific conditions.\u003c\/li\u003e \u003cli\u003eGeneral proteolysis tool in protein chemistry method development and substrate profiling.\u003c\/li\u003e \u003cli\u003eBenchmark reagent when evaluating immobilized-enzyme performance in downstream analytics.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eProteolysis outcomes depend on substrate sequence\/structure and reaction conditions; verify fragment identity with orthogonal methods.\u003c\/li\u003e \u003cli\u003eImmobilization can alter apparent activity and accessibility; interpret rates and yields relative to free-enzyme benchmarks.\u003c\/li\u003e \u003cli\u003eAvoid extrapolating digestion performance across antibody subclasses without confirmatory characterization.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=papain immobilized antibody fragmentation Fab Fc - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=papain immobilized antibody fragmentation Fab Fc - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=papain immobilized antibody fragmentation Fab Fc%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"5000 UN","offer_id":53052975972717,"sku":"CSB-NP005501Pl-5000UN","price":180.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP005501Pl-SDS.jpg?v=1772166487"},{"product_id":"chicken-ovomucoid-bhp10506081","title":"Chicken Ovomucoid","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative chicken ovomucoid (OVM) is purified from chicken egg white and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Storage Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e Allergen Gal d I\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eOvomucoid is a glycoprotein protease inhibitor in egg white and is a major, relatively heat-stable egg allergen component. Its structural stability and glycosylation contribute to its prominence in food allergy research.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eFood allergy research focusing on stable allergen components and epitope mapping under processing conditions.\u003c\/li\u003e \u003cli\u003eAnalytical standardization for allergen quantification in complex food matrices (RUO).\u003c\/li\u003e \u003cli\u003eStudies of protease inhibitors and their roles in host defense and protein stability.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eReference material for allergen-related immunoassays and analytical method development.\u003c\/li\u003e \u003cli\u003eProtein stability studies examining processing-resistant glycoproteins.\u003c\/li\u003e \u003cli\u003eBiochemical studies of protease inhibitor interactions (concept-level).\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eGlycosylation heterogeneity can influence antibody recognition and assay calibration.\u003c\/li\u003e \u003cli\u003eProcessing conditions can change extractability rather than intrinsic abundance; interpret food-matrix results carefully.\u003c\/li\u003e \u003cli\u003eProtease inhibitor activity is context-dependent; confirm with orthogonal measures when needed.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=ovomucoid OVM egg allergen - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=ovomucoid OVM egg allergen - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=ovomucoid OVM egg allergen%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"10 mg","offer_id":53052976005485,"sku":"CSB-NP004001C-10MG","price":1600.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052976038253,"sku":"CSB-NP004001C-1MG","price":200.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP004001C-SDS.jpg?v=1772166488"},{"product_id":"mouse-immunoglobulin-g2b-bhp10506036","title":"Mouse Immunoglobulin G2b","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative mouse immunoglobulin G2b (IgG2b) is purified from pooled normal mouse serum and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Immunoglobulin\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eImmunoglobulin G (IgG) is a Y-shaped antibody composed of two heavy and two light chains, with antigen-binding Fab regions and an Fc region that can engage Fc receptors and complement. IgG is central to humoral immunity and is widely used as a reference reagent for immunoassays, Fc biology studies, and antibody engineering research. IgG2b denotes a subclass with distinct Fc-mediated effector properties and receptor interactions that can matter in comparative studies.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eFc glycosylation and Fc receptor signaling as drivers of antibody effector function and immune modulation.\u003c\/li\u003e \u003cli\u003eAntibody fragmentation and engineering strategies used to dissect antigen binding vs Fc-mediated interactions.\u003c\/li\u003e \u003cli\u003eAssay standardization efforts that use well-defined IgG materials to improve quantitative comparability across platforms.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eCalibration\/controls for immunoassays and secondary antibody workflows where IgG is a common analyte or standard.\u003c\/li\u003e \u003cli\u003eFc receptor and complement engagement studies (conceptual) that separate binding from downstream effector mechanisms.\u003c\/li\u003e \u003cli\u003eBenchmark reagent in antibody purification, formulation, and stability method development.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eGlycosylation patterns on the Fc region can vary by species and source and can influence Fc receptor\/complement interactions.\u003c\/li\u003e \u003cli\u003ePolyclonal IgG preparations represent a mixture of specificities; interpret binding results accordingly.\u003c\/li\u003e \u003cli\u003eFragment formats (Fc\/Fab) change which interactions are possible; align fragment choice to the biology you want to probe.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=immunoglobulin G IgG structure Fc receptor - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=immunoglobulin G IgG structure Fc receptor - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=immunoglobulin G IgG structure Fc receptor%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"10 mg","offer_id":53052976071021,"sku":"CSB-NP008301m-10MG","price":1205.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052976103789,"sku":"CSB-NP008301m-1MG","price":150.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP008301m-SDS.jpg?v=1772166487"},{"product_id":"mouse-hemoglobin-bhp10506174","title":"Mouse Hemoglobin","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative mouse hemoglobin (HGB) is purified from Mouse erythrocytes and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Binding Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e haemoglobin,Hb\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eHemoglobin is a tetrameric heme protein in red blood cells that transports oxygen and carbon dioxide. Cooperative ligand binding and allosteric regulation make hemoglobin a foundational model for studying protein conformational dynamics and redox chemistry.\u003c\/p\u003e\u003cp\u003eHemoglobin is involved in oxygen transport from the lung to the various peripheral tissues. The alpha (HBA) and beta (HBB) loci determine the structure of the 2 types of polypeptide chains in adult Hemoglobin.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eRed blood cell physiology and oxidative stress research linking hemoglobin chemistry to cellular homeostasis.\u003c\/li\u003e \u003cli\u003eBiophysical studies of allostery and cooperative binding as general principles of protein regulation.\u003c\/li\u003e \u003cli\u003eMethod development for hemoglobin quantification and variant\/oxidation-state profiling (RUO).\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eOxygen\/ligand-binding and allostery studies using a classic multi-subunit protein system.\u003c\/li\u003e \u003cli\u003eReference material in analytical assays measuring hemoglobin or heme-protein content.\u003c\/li\u003e \u003cli\u003eRedox and oxidative modification studies (e.g., methemoglobin formation) as interpretable biochemical readouts.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eHemoglobin exists in multiple oxidation and ligand-bound states; these can shift spectra and assay signals.\u003c\/li\u003e \u003cli\u003eSpecies and strain differences can affect sequence and regulatory behavior; match to your model organism.\u003c\/li\u003e \u003cli\u003eIn complex samples, hemolysis and handling can strongly impact apparent hemoglobin measurements.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=hemoglobin HGB - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=hemoglobin HGB - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=hemoglobin HGB%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052976136557,"sku":"CSB-NP004901m-1G","price":245.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052976169325,"sku":"CSB-NP004901m-100MG","price":30.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP004901m-SDS.jpg?v=1772166487"},{"product_id":"human-hemoglobin-protein-bhp10506357","title":"human Hemoglobin protein","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative human hemoglobin (HGB) is purified from Human erythrocytes and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Binding Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e haemoglobin,Hb\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eHemoglobin is a tetrameric heme protein in red blood cells that transports oxygen and carbon dioxide. Cooperative ligand binding and allosteric regulation make hemoglobin a foundational model for studying protein conformational dynamics and redox chemistry.\u003c\/p\u003e\u003cp\u003eHemoglobin is involved in oxygen transport from the lung to the various peripheral tissues. The alpha (HBA) and beta (HBB) loci determine the structure of the 2 types of polypeptide chains in adult Hemoglobin.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eRed blood cell physiology and oxidative stress research linking hemoglobin chemistry to cellular homeostasis.\u003c\/li\u003e \u003cli\u003eBiophysical studies of allostery and cooperative binding as general principles of protein regulation.\u003c\/li\u003e \u003cli\u003eMethod development for hemoglobin quantification and variant\/oxidation-state profiling (RUO).\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eOxygen\/ligand-binding and allostery studies using a classic multi-subunit protein system.\u003c\/li\u003e \u003cli\u003eReference material in analytical assays measuring hemoglobin or heme-protein content.\u003c\/li\u003e \u003cli\u003eRedox and oxidative modification studies (e.g., methemoglobin formation) as interpretable biochemical readouts.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eHemoglobin exists in multiple oxidation and ligand-bound states; these can shift spectra and assay signals.\u003c\/li\u003e \u003cli\u003eSpecies and strain differences can affect sequence and regulatory behavior; match to your model organism.\u003c\/li\u003e \u003cli\u003eIn complex samples, hemolysis and handling can strongly impact apparent hemoglobin measurements.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=hemoglobin HGB - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=hemoglobin HGB - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=hemoglobin HGB%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052976202093,"sku":"CSB-NP002401h-1G","price":400.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052976234861,"sku":"CSB-NP002401h-100MG","price":50.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP002401h-SDS.jpg?v=1772166487"},{"product_id":"lysozyme-bhp10506798","title":"lysozyme","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative chicken lysozyme (LYZ) is purified from chicken egg white and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Attacin\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eLysozyme is a well-characterized enzyme that hydrolyzes peptidoglycan in bacterial cell walls and is a classic model protein in enzymology, stability, and protein folding studies. In mammals, lysozyme also contributes to innate defense in secretions and tissues.\u003c\/p\u003e\u003cp\u003eLysozymes have primarily a bacteriolytic function; those in tissues and body fluids are associated with the monocyte-macrophage system and enhance the activity of immunoagents.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eProtein folding and aggregation research using lysozyme as a tractable model for structure–function relationships.\u003c\/li\u003e \u003cli\u003eAntimicrobial biology studying how enzymes and peptides shape bacterial susceptibility and stress responses.\u003c\/li\u003e \u003cli\u003eAnalytical method development (chromatography, MS) where lysozyme serves as a benchmark protein.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eEnzymology and kinetics method development using a well-studied hydrolase system.\u003c\/li\u003e \u003cli\u003eReference protein for purification, formulation, and stability studies.\u003c\/li\u003e \u003cli\u003eControls\/standards in analytical workflows where a consistent model protein is helpful.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eEnzymatic activity depends on substrate availability and solution conditions; interpret activity-related observations cautiously.\u003c\/li\u003e \u003cli\u003eSome lysozyme preparations may include multiple isoforms or modifications; verify identity for high-precision work.\u003c\/li\u003e \u003cli\u003eAntimicrobial effects in mixed systems can be indirect; confirm with complementary assays.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=lysozyme LYZ - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=lysozyme LYZ - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=lysozyme LYZ%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052976267629,"sku":"CSB-NP004201C-1G","price":100.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052976300397,"sku":"CSB-NP004201C-100MG","price":25.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP004201C-SDS.jpg?v=1772166487"},{"product_id":"human-igg-fc-fragment-bhp10506040","title":"Human IgG Fc fragment","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative human immunoglobulin G (IgG) is purified from Human serum IgG digested with papain and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFragment format (Fc):\u003c\/strong\u003e Contains the constant Fc region without antigen-binding domains, enabling Fc-focused studies.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Other Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;90%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e fragment crystallizable region\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eImmunoglobulin G (IgG) is a Y-shaped antibody composed of two heavy and two light chains, with antigen-binding Fab regions and an Fc region that can engage Fc receptors and complement. IgG is central to humoral immunity and is widely used as a reference reagent for immunoassays, Fc biology studies, and antibody engineering research.\u003c\/p\u003e\u003cp\u003eThe fragment crystallizable region (Fc region) is the tail region of an antibody that interacts with cell surface receptors called Fc receptors and some proteins of the complement system. This property allows antibodies to activate the immune system.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eFc glycosylation and Fc receptor signaling as drivers of antibody effector function and immune modulation.\u003c\/li\u003e \u003cli\u003eAntibody fragmentation and engineering strategies used to dissect antigen binding vs Fc-mediated interactions.\u003c\/li\u003e \u003cli\u003eAssay standardization efforts that use well-defined IgG materials to improve quantitative comparability across platforms.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eCalibration\/controls for immunoassays and secondary antibody workflows where IgG is a common analyte or standard.\u003c\/li\u003e \u003cli\u003eFc receptor and complement engagement studies (conceptual) that separate binding from downstream effector mechanisms.\u003c\/li\u003e \u003cli\u003eBenchmark reagent in antibody purification, formulation, and stability method development.\u003c\/li\u003e \u003cli\u003eFc receptor\/complement interaction concepts and assay benchmarking where antigen binding is intentionally absent.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eGlycosylation patterns on the Fc region can vary by species and source and can influence Fc receptor\/complement interactions.\u003c\/li\u003e \u003cli\u003ePolyclonal IgG preparations represent a mixture of specificities; interpret binding results accordingly.\u003c\/li\u003e \u003cli\u003eFragment formats (Fc\/Fab) change which interactions are possible; align fragment choice to the biology you want to probe.\u003c\/li\u003e \u003cli\u003eFc fragments lack Fab-mediated antigen binding; observed effects reflect Fc-dependent interactions and solution properties.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=immunoglobulin G IgG structure Fc receptor - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=immunoglobulin G IgG structure Fc receptor - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=immunoglobulin G IgG structure Fc receptor%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"10 mg","offer_id":53052976333165,"sku":"CSB-NP005401h-10MG","price":2000.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052976365933,"sku":"CSB-NP005401h-1MG","price":250.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP005401h-SDS.jpg?v=1772166487"},{"product_id":"chicken-serum-transferrin-bhp10506053","title":"Chicken Serum Transferrin","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative chicken transferrin (TF) is purified from e Chicken Serum and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Carrier Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;90%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e Serotransferrin,Beta-1 metal-binding globulin,Siderophilin\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eTransferrin is a glycoprotein that binds ferric iron (Fe³⁺) with high affinity and transports it through blood and extracellular fluids. Cellular iron uptake commonly occurs via transferrin receptor–mediated endocytosis, linking transferrin biology to proliferation, metabolism, and stress responses.\u003c\/p\u003e\u003cp\u003eTransferrin is a single polypeptide chain glycoprotein and is a member of the iron binding family of proteins. It has a molecular weight of 77 kDa and a serum concentration range of 1800 to 2700 mg\/L.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eIron homeostasis research intersecting with oxidative stress and ferroptosis, where iron availability and transport pathways are central.\u003c\/li\u003e \u003cli\u003eTransferrin receptor biology in cancer and immune cells as a window into nutrient uptake and activation states.\u003c\/li\u003e \u003cli\u003eGlycosylation and iron-loading state (apo vs holo) as variables influencing binding, trafficking, and assay readouts.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eReceptor-binding and uptake studies to probe transferrin receptor activity in cells and tissues.\u003c\/li\u003e \u003cli\u003eIron-binding\/transfer concepts in biochemical assays, including comparisons of apo- and holo-transferrin behaviors.\u003c\/li\u003e \u003cli\u003eCalibration\/controls for immunoassays and proteomics where transferrin is a common high-abundance plasma protein.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eIron saturation state strongly affects transferrin’s biochemical behavior; interpret results in light of apo\/holo mixtures.\u003c\/li\u003e \u003cli\u003eAs a glycoprotein, transferrin may present glycoform heterogeneity; native preparations can reflect source-dependent variation.\u003c\/li\u003e \u003cli\u003eSpecies differences and plasma-derived co-factors can influence receptor interactions; align the reagent with your experimental model.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=transferrin TF - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=transferrin TF - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=transferrin TF%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"10 mg","offer_id":53052976398701,"sku":"CSB-NP004601C-10MG","price":4565.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052976431469,"sku":"CSB-NP004601C-1MG","price":570.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP004601C-SDS.jpg?v=1772166487"},{"product_id":"horse-immunoglobulin-g-bhp10506065","title":"Horse Immunoglobulin G","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative horse immunoglobulin G (IgG) is purified from pooled normal horse serum and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Immunoglobulin\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eImmunoglobulin G (IgG) is a Y-shaped antibody composed of two heavy and two light chains, with antigen-binding Fab regions and an Fc region that can engage Fc receptors and complement. IgG is central to humoral immunity and is widely used as a reference reagent for immunoassays, Fc biology studies, and antibody engineering research.\u003c\/p\u003e\u003cp\u003eIgG is a monomeric immunoglobulin, built of two heavy chains gamma and two light chains. Each molecule has two antigen binding sites.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eFc glycosylation and Fc receptor signaling as drivers of antibody effector function and immune modulation.\u003c\/li\u003e \u003cli\u003eAntibody fragmentation and engineering strategies used to dissect antigen binding vs Fc-mediated interactions.\u003c\/li\u003e \u003cli\u003eAssay standardization efforts that use well-defined IgG materials to improve quantitative comparability across platforms.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eCalibration\/controls for immunoassays and secondary antibody workflows where IgG is a common analyte or standard.\u003c\/li\u003e \u003cli\u003eFc receptor and complement engagement studies (conceptual) that separate binding from downstream effector mechanisms.\u003c\/li\u003e \u003cli\u003eBenchmark reagent in antibody purification, formulation, and stability method development.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eGlycosylation patterns on the Fc region can vary by species and source and can influence Fc receptor\/complement interactions.\u003c\/li\u003e \u003cli\u003ePolyclonal IgG preparations represent a mixture of specificities; interpret binding results accordingly.\u003c\/li\u003e \u003cli\u003eFragment formats (Fc\/Fab) change which interactions are possible; align fragment choice to the biology you want to probe.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=immunoglobulin G IgG structure Fc receptor - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=immunoglobulin G IgG structure Fc receptor - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=immunoglobulin G IgG structure Fc receptor%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052976464237,"sku":"CSB-NP001001Hs-1G","price":1250.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052976497005,"sku":"CSB-NP001001Hs-100MG","price":250.0,"currency_code":"USD","in_stock":true},{"title":"10 mg","offer_id":53052976529773,"sku":"CSB-NP001001Hs-10MG","price":100.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052976562541,"sku":"CSB-NP001001Hs-1MG","price":50.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP001001Hs-SDS.jpg?v=1772166487"},{"product_id":"sheep-immunoglobulin-g-bhp10506074","title":"Sheep Immunoglobulin G","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative sheep immunoglobulin G (IgG) is purified from pooled normal sheep serum and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Immunoglobulin\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eImmunoglobulin G (IgG) is a Y-shaped antibody composed of two heavy and two light chains, with antigen-binding Fab regions and an Fc region that can engage Fc receptors and complement. IgG is central to humoral immunity and is widely used as a reference reagent for immunoassays, Fc biology studies, and antibody engineering research.\u003c\/p\u003e\u003cp\u003eIgG is a monomeric immunoglobulin, built of two heavy chains gamma and two light chains. Each molecule has two antigen binding sites.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eFc glycosylation and Fc receptor signaling as drivers of antibody effector function and immune modulation.\u003c\/li\u003e \u003cli\u003eAntibody fragmentation and engineering strategies used to dissect antigen binding vs Fc-mediated interactions.\u003c\/li\u003e \u003cli\u003eAssay standardization efforts that use well-defined IgG materials to improve quantitative comparability across platforms.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eCalibration\/controls for immunoassays and secondary antibody workflows where IgG is a common analyte or standard.\u003c\/li\u003e \u003cli\u003eFc receptor and complement engagement studies (conceptual) that separate binding from downstream effector mechanisms.\u003c\/li\u003e \u003cli\u003eBenchmark reagent in antibody purification, formulation, and stability method development.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eGlycosylation patterns on the Fc region can vary by species and source and can influence Fc receptor\/complement interactions.\u003c\/li\u003e \u003cli\u003ePolyclonal IgG preparations represent a mixture of specificities; interpret binding results accordingly.\u003c\/li\u003e \u003cli\u003eFragment formats (Fc\/Fab) change which interactions are possible; align fragment choice to the biology you want to probe.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=immunoglobulin G IgG structure Fc receptor - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=immunoglobulin G IgG structure Fc receptor - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=immunoglobulin G IgG structure Fc receptor%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052976660845,"sku":"CSB-NP001101Sh-1G","price":1250.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052976693613,"sku":"CSB-NP001101Sh-100MG","price":250.0,"currency_code":"USD","in_stock":true},{"title":"10 mg","offer_id":53052976726381,"sku":"CSB-NP001101Sh-10MG","price":100.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052976759149,"sku":"CSB-NP001101Sh-1MG","price":50.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP001101Sh-SDS.jpg?v=1772166488"},{"product_id":"rabbit-hemoglobin-bhp10506415","title":"Rabbit Hemoglobin","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative rabbit hemoglobin (HGB) is purified from rabbit erythrocyte and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Binding Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e haemoglobin,Hb\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eHemoglobin is a tetrameric heme protein in red blood cells that transports oxygen and carbon dioxide. Cooperative ligand binding and allosteric regulation make hemoglobin a foundational model for studying protein conformational dynamics and redox chemistry.\u003c\/p\u003e\u003cp\u003eHemoglobin is involved in oxygen transport from the lung to the various peripheral tissues. The alpha (HBA) and beta (HBB) loci determine the structure of the 2 types of polypeptide chains in adult Hemoglobin.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eRed blood cell physiology and oxidative stress research linking hemoglobin chemistry to cellular homeostasis.\u003c\/li\u003e \u003cli\u003eBiophysical studies of allostery and cooperative binding as general principles of protein regulation.\u003c\/li\u003e \u003cli\u003eMethod development for hemoglobin quantification and variant\/oxidation-state profiling (RUO).\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eOxygen\/ligand-binding and allostery studies using a classic multi-subunit protein system.\u003c\/li\u003e \u003cli\u003eReference material in analytical assays measuring hemoglobin or heme-protein content.\u003c\/li\u003e \u003cli\u003eRedox and oxidative modification studies (e.g., methemoglobin formation) as interpretable biochemical readouts.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eHemoglobin exists in multiple oxidation and ligand-bound states; these can shift spectra and assay signals.\u003c\/li\u003e \u003cli\u003eSpecies and strain differences can affect sequence and regulatory behavior; match to your model organism.\u003c\/li\u003e \u003cli\u003eIn complex samples, hemolysis and handling can strongly impact apparent hemoglobin measurements.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=hemoglobin HGB - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=hemoglobin HGB - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=hemoglobin HGB%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052976595309,"sku":"CSB-NP005001Rb-1G","price":245.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052976628077,"sku":"CSB-NP005001Rb-100MG","price":30.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP005001Rb-SDS.jpg?v=1772166487"},{"product_id":"human-myoglobin-protein-bhp10506057","title":"human Myoglobin protein","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative human myoglobin (MB) is purified from Human heart tissue and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Other Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eMyoglobin is an oxygen-binding heme protein primarily found in muscle, where it supports oxygen storage and diffusion. It is widely used as a model heme protein for studying ligand binding, redox chemistry, and protein structure.\u003c\/p\u003e\u003cp\u003eServes as a reserve supply of oxygen and facilitates the movement of oxygen within muscles. Belongs to the globin family\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eRedox and oxidative stress research examining heme proteins as sources and sinks of reactive species.\u003c\/li\u003e \u003cli\u003eStructural and spectroscopic studies of heme–ligand interactions (O₂, CO, NO) as model systems.\u003c\/li\u003e \u003cli\u003eMethod development in proteomics and biophysics where myoglobin is a convenient benchmark protein.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eLigand-binding and spectroscopic studies that probe heme coordination and conformational changes.\u003c\/li\u003e \u003cli\u003eReference standard in analytical workflows and protein chemistry method validation.\u003c\/li\u003e \u003cli\u003eComparative studies of heme-protein stability and oxidation states.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eOxidation state and heme integrity can affect signals; interpret results with attention to redox context.\u003c\/li\u003e \u003cli\u003eMyoglobin behavior can depend on pH and ligand availability; document assay conditions for comparability.\u003c\/li\u003e \u003cli\u003eSpecies differences exist; align reagent choice with your biological model.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=myoglobin MB - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=myoglobin MB - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=myoglobin MB%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052976791917,"sku":"CSB-NP079141h-1G","price":173335.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052976824685,"sku":"CSB-NP079141h-100MG","price":26665.0,"currency_code":"USD","in_stock":true},{"title":"10 mg","offer_id":53052976857453,"sku":"CSB-NP079141h-10MG","price":3335.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052976890221,"sku":"CSB-NP079141h-1MG","price":630.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP079141h-SDS.jpg?v=1772166488"},{"product_id":"porcine-serum-albumin-bhp10506069","title":"Porcine serum albumin","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative porcine serum albumin (ALB) is purified from pooled normal porcine serum and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Carrier Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eSerum albumin is the major soluble protein in blood plasma and a key carrier for fatty acids, hormones, metabolites, and many small molecules. Its abundance and broad binding capacity make it widely used as a reference protein in biochemical assays and proteomics, and as a model for studying ligand binding and protein stability.\u003c\/p\u003e\u003cp\u003eSerum albumin, the main protein of plasma, has a good binding capacity for water, Ca(2+), Na(+), K(+), fatty acids, hormones, bilirubin and drugs. Its main function is the regulation of the colloidal osmotic pressure of blood.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eQuantitative proteomics and biomarker work where albumin depletion\/enrichment strategies impact downstream detection.\u003c\/li\u003e \u003cli\u003eProtein–ligand and protein–drug interaction studies, including how oxidative or glycation-related modifications can alter binding.\u003c\/li\u003e \u003cli\u003eAlbumin-based carrier concepts in biomaterials and delivery research (e.g., albumin-binding domains, albumin nanoparticles).\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eReference material for protein quantification (standards\/controls) and method development.\u003c\/li\u003e \u003cli\u003eLigand-binding and stability studies (fatty acids, dyes, small molecules) where albumin’s promiscuous binding is central to interpretation.\u003c\/li\u003e \u003cli\u003eBlocking\/carrier reagent concepts in immunoassay development (interpretation-focused; avoid protocol details).\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eAlbumin can carry endogenous ligands and can exist in multiple modified forms (oxidation, glycation) that may shift binding behavior.\u003c\/li\u003e \u003cli\u003eAlbumin from different species can differ in sequence and ligand affinity; match species to your model system when possible.\u003c\/li\u003e \u003cli\u003eHigh-abundance proteins can mask low-abundance analytes in complex mixtures; consider this when interpreting assay sensitivity.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=serum albumin ALB - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=serum albumin ALB - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=serum albumin ALB%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052976922989,"sku":"CSB-NP002101p-1G","price":1885.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052976955757,"sku":"CSB-NP002101p-100MG","price":375.0,"currency_code":"USD","in_stock":true},{"title":"10 mg","offer_id":53052976988525,"sku":"CSB-NP002101p-10MG","price":150.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052977021293,"sku":"CSB-NP002101p-1MG","price":75.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP002101p-SDS.jpg?v=1772166487"},{"product_id":"human-retinol-binding-protein-4-bhp10506059","title":"human Retinol-binding protein 4","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative human RBP4 is purified from human urine and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Other Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eRetinol-binding protein 4 (RBP4) is the primary plasma carrier for retinol (vitamin A alcohol) and commonly circulates in complex with transthyretin, which helps limit renal filtration. RBP4 is studied at the intersection of vitamin A transport, metabolism, and endocrine-like signaling.\u003c\/p\u003e\u003cp\u003eDelivers retinol from the liver stores to the peripheral tissues. In plasma, the RBP-retinol complex interacts with transthyretin, this prevents its loss by filtration through the kidney glomeruli.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eMetabolic research examining RBP4 as a context marker or mediator in insulin resistance and adipose signaling (RUO).\u003c\/li\u003e \u003cli\u003eVitamin A biology and nuclear receptor signaling studies where retinoid availability shapes transcriptional programs.\u003c\/li\u003e \u003cli\u003eSystems-level plasma proteomics where RBP4 abundance and complex formation can influence measurement and interpretation.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eControls\/standards for immunoassays measuring RBP4 in biological samples.\u003c\/li\u003e \u003cli\u003eLigand-binding studies focused on retinol transport and protein–protein complex formation with transthyretin.\u003c\/li\u003e \u003cli\u003eNutrient transport pathway studies integrating retinoid metabolism with cellular differentiation and immunity concepts.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eLigand occupancy (retinol-bound vs apo) and complex formation can influence behavior and assay signals.\u003c\/li\u003e \u003cli\u003eRBP4 biology is tissue- and context-dependent; interpret changes alongside complementary metabolic markers.\u003c\/li\u003e \u003cli\u003eSample matrix effects can be substantial in plasma\/serum measurements; include appropriate controls.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=RBP4 retinol-binding protein 4 - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=RBP4 retinol-binding protein 4 - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=RBP4 retinol-binding protein 4%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"1 g","offer_id":53052977054061,"sku":"CSB-NP070541h-1G","price":173335.0,"currency_code":"USD","in_stock":true},{"title":"100 mg","offer_id":53052977086829,"sku":"CSB-NP070541h-100MG","price":26665.0,"currency_code":"USD","in_stock":true},{"title":"10 mg","offer_id":53052977119597,"sku":"CSB-NP070541h-10MG","price":3335.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052977152365,"sku":"CSB-NP070541h-1MG","price":630.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP070541h-SDS.jpg?v=1772166487"},{"product_id":"bovine-transferrin-bhp10506088","title":"Bovine Transferrin","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative bovine transferrin (TF) is purified from Bovine Serum and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Carrier Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;90%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e Serotransferrin,Beta-1 metal-binding globulin,Siderophilin\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eTransferrin is a glycoprotein that binds ferric iron (Fe³⁺) with high affinity and transports it through blood and extracellular fluids. Cellular iron uptake commonly occurs via transferrin receptor–mediated endocytosis, linking transferrin biology to proliferation, metabolism, and stress responses.\u003c\/p\u003e\u003cp\u003eTransferrins are iron binding transport proteins which can bind two Fe3+ ions in association with the binding of an anion, usually bicarbonate. It is responsible for the transport of iron from sites of absorption and heme degradation to those of storage and utilization.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eIron homeostasis research intersecting with oxidative stress and ferroptosis, where iron availability and transport pathways are central.\u003c\/li\u003e \u003cli\u003eTransferrin receptor biology in cancer and immune cells as a window into nutrient uptake and activation states.\u003c\/li\u003e \u003cli\u003eGlycosylation and iron-loading state (apo vs holo) as variables influencing binding, trafficking, and assay readouts.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eReceptor-binding and uptake studies to probe transferrin receptor activity in cells and tissues.\u003c\/li\u003e \u003cli\u003eIron-binding\/transfer concepts in biochemical assays, including comparisons of apo- and holo-transferrin behaviors.\u003c\/li\u003e \u003cli\u003eCalibration\/controls for immunoassays and proteomics where transferrin is a common high-abundance plasma protein.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eIron saturation state strongly affects transferrin’s biochemical behavior; interpret results in light of apo\/holo mixtures.\u003c\/li\u003e \u003cli\u003eAs a glycoprotein, transferrin may present glycoform heterogeneity; native preparations can reflect source-dependent variation.\u003c\/li\u003e \u003cli\u003eSpecies differences and plasma-derived co-factors can influence receptor interactions; align the reagent with your experimental model.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=transferrin TF - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=transferrin TF - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=transferrin TF%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"10 mg","offer_id":53052977185133,"sku":"CSB-NP003501B-10MG","price":1600.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052977217901,"sku":"CSB-NP003501B-1MG","price":200.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP003501B-SDS.jpg?v=1772166488"},{"product_id":"goat-igg-fab-fragment-bhp10506044","title":"Goat IgG Fab fragment","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative goat immunoglobulin G (IgG) is purified from Goat serum IgG digested with papain and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFragment format (Fab):\u003c\/strong\u003e Contains antigen-binding domains without Fc, useful for Fc-independent binding comparisons.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Other Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e fragment antigen-binding\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eImmunoglobulin G (IgG) is a Y-shaped antibody composed of two heavy and two light chains, with antigen-binding Fab regions and an Fc region that can engage Fc receptors and complement. IgG is central to humoral immunity and is widely used as a reference reagent for immunoassays, Fc biology studies, and antibody engineering research.\u003c\/p\u003e\u003cp\u003eThe fragment antigen-binding (Fab fragment) is a region on an antibody that binds to antigens. It is composed of one constant and one variable domain of each of the heavy and the light chain.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eFc glycosylation and Fc receptor signaling as drivers of antibody effector function and immune modulation.\u003c\/li\u003e \u003cli\u003eAntibody fragmentation and engineering strategies used to dissect antigen binding vs Fc-mediated interactions.\u003c\/li\u003e \u003cli\u003eAssay standardization efforts that use well-defined IgG materials to improve quantitative comparability across platforms.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eCalibration\/controls for immunoassays and secondary antibody workflows where IgG is a common analyte or standard.\u003c\/li\u003e \u003cli\u003eFc receptor and complement engagement studies (conceptual) that separate binding from downstream effector mechanisms.\u003c\/li\u003e \u003cli\u003eBenchmark reagent in antibody purification, formulation, and stability method development.\u003c\/li\u003e \u003cli\u003eAntigen-binding comparisons that minimize Fc-mediated effects (e.g., Fc receptor engagement or complement activation).\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eGlycosylation patterns on the Fc region can vary by species and source and can influence Fc receptor\/complement interactions.\u003c\/li\u003e \u003cli\u003ePolyclonal IgG preparations represent a mixture of specificities; interpret binding results accordingly.\u003c\/li\u003e \u003cli\u003eFragment formats (Fc\/Fab) change which interactions are possible; align fragment choice to the biology you want to probe.\u003c\/li\u003e \u003cli\u003eFab fragments lack Fc-mediated interactions; binding behavior may differ from full-length IgG due to avidity and geometry changes.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=immunoglobulin G IgG structure Fc receptor - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=immunoglobulin G IgG structure Fc receptor - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=immunoglobulin G IgG structure Fc receptor%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"10 mg","offer_id":53052977250669,"sku":"CSB-NP005601G-10MG","price":2400.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052977283437,"sku":"CSB-NP005601G-1MG","price":300.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP005601G-SDS.jpg?v=1772166487"},{"product_id":"rat-igg-fc-fragment-bhp10506043","title":"Rat IgG Fc fragment","description":"\u003ch2\u003eOverview\u003c\/h2\u003e \u003cp\u003eNative rat immunoglobulin G (IgG) is purified from Rat serum IgG digested with papain and supplied as a research reagent. It is commonly used as a reference material in biochemical and analytical workflows, and to support interpretation when naturally occurring proteoforms (for example, glycosylation or other post‑translational modifications) may matter.\u003c\/p\u003e \u003ch2\u003eKey elements and design rationale\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eNative-source preparation:\u003c\/strong\u003e Purified from a biological source, which can be useful when studying naturally occurring proteoforms and complex formation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFragment format (Fc):\u003c\/strong\u003e Contains the constant Fc region without antigen-binding domains, enabling Fc-focused studies.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolecular form:\u003c\/strong\u003e Full length protein.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClassification:\u003c\/strong\u003e Other Protein\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePurity:\u003c\/strong\u003e \u0026gt;95%(SDS-PAGE) (as reported).\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e Liquid\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCommon names \/ aliases:\u003c\/strong\u003e fragment crystallizable region\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eThese elements help determine how the reagent behaves in binding, stability, or quantitative measurements, and how closely it reflects biology in the chosen model system.\u003c\/p\u003e \u003ch2\u003eBiological background\u003c\/h2\u003e \u003cp\u003eImmunoglobulin G (IgG) is a Y-shaped antibody composed of two heavy and two light chains, with antigen-binding Fab regions and an Fc region that can engage Fc receptors and complement. IgG is central to humoral immunity and is widely used as a reference reagent for immunoassays, Fc biology studies, and antibody engineering research.\u003c\/p\u003e\u003cp\u003eThe fragment crystallizable region (Fc region) is the tail region of an antibody that interacts with cell surface receptors called Fc receptors and some proteins of the complement system. This property allows antibodies to activate the immune system.\u003c\/p\u003e \u003ch2\u003eResearch relevance and current trends\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eFc glycosylation and Fc receptor signaling as drivers of antibody effector function and immune modulation.\u003c\/li\u003e \u003cli\u003eAntibody fragmentation and engineering strategies used to dissect antigen binding vs Fc-mediated interactions.\u003c\/li\u003e \u003cli\u003eAssay standardization efforts that use well-defined IgG materials to improve quantitative comparability across platforms.\u003c\/li\u003e \u003c\/ul\u003e \u003ch2\u003eCommon research applications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eCalibration\/controls for immunoassays and secondary antibody workflows where IgG is a common analyte or standard.\u003c\/li\u003e \u003cli\u003eFc receptor and complement engagement studies (conceptual) that separate binding from downstream effector mechanisms.\u003c\/li\u003e \u003cli\u003eBenchmark reagent in antibody purification, formulation, and stability method development.\u003c\/li\u003e \u003cli\u003eFc receptor\/complement interaction concepts and assay benchmarking where antigen binding is intentionally absent.\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eUse changes in abundance, binding, or activity readouts as context-dependent signals. In many systems, differences may reflect regulation, compartment shifts, complex formation, or sample-matrix effects rather than a single direct mechanism.\u003c\/p\u003e \u003ch2\u003eNotes for experimental interpretation\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eGlycosylation patterns on the Fc region can vary by species and source and can influence Fc receptor\/complement interactions.\u003c\/li\u003e \u003cli\u003ePolyclonal IgG preparations represent a mixture of specificities; interpret binding results accordingly.\u003c\/li\u003e \u003cli\u003eFragment formats (Fc\/Fab) change which interactions are possible; align fragment choice to the biology you want to probe.\u003c\/li\u003e \u003cli\u003eFc fragments lack Fab-mediated antigen binding; observed effects reflect Fc-dependent interactions and solution properties.\u003c\/li\u003e \u003c\/ul\u003e \u003c!-- Sources (internal): - UniProt: https:\/\/www.uniprot.org\/uniprotkb?query=immunoglobulin G IgG structure Fc receptor - NCBI Gene: https:\/\/www.ncbi.nlm.nih.gov\/gene\/?term=immunoglobulin G IgG structure Fc receptor - PubMed: https:\/\/pubmed.ncbi.nlm.nih.gov\/?term=immunoglobulin G IgG structure Fc receptor%20review --\u003e","brand":"CUSABIO TECHNOLOGY LLC","offers":[{"title":"10 mg","offer_id":53052977316205,"sku":"CSB-NP007001r-10MG","price":2000.0,"currency_code":"USD","in_stock":true},{"title":"1 mg","offer_id":53052977348973,"sku":"CSB-NP007001r-1MG","price":250.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7424\/7277\/files\/CSB-NP007001r-SDS.jpg?v=1772166487"}],"url":"https:\/\/www.ebiohippo.com\/collections\/cusabio-proteins.oembed?page=410","provider":"BioHippo","version":"1.0","type":"link"}