| Field | Specification |
|---|---|
| Mfr No | |
| Clonality | |
| Conjugate | |
| Host | |
| Immunogen | Amino acids QLAHIQALISGIEAQLGDVRADSERQNQEYQRLMDIKSR of human KRT19 were used as the immunogen for the CK19 antibody. |
| Isotype | |
| Product Type | |
| Purity | |
| Reactivity | |
| Storage | |
| Target | |
| UniProt # |
Overview
CK19 Antibody / Cytokeratin 19 is a research-use-only Rabbit polyclonal (rabbit origin) Rabbit IgG directed against CK19 / Cytokeratin 19. It is supplied for interpretation-focused detection and comparative profiling in WB, IHC, IF, FACS. Reported localization context: Cytoplasmic.
Key elements and design rationale
- Target context: This antibody is raised against Amino acids QLAHIQALISGIEAQLGDVRADSERQNQEYQRLMDIKSR of human KRT19 were used as the immunogen for the CK19 antibody.. Epitope context matters because isoforms, processing, and post-translational modifications can change what is accessible in a given assay.
- Format: Antigen affinity purified. Format influences background and compatibility with different detection chemistries; conjugated formats (when present) can simplify multiplexing and reduce reliance on secondary reagents.
- Species reactivity: Human, Mouse, Rat. Cross-species performance can vary with sequence divergence and epitope conservation, so interpretation should be anchored with appropriate biological controls.
- Localization: Cytoplasmic. Subcellular compartment context can help guide expectations in imaging assays and informs fractionation-based comparisons in lysate workflows.
- Applications: WB, IHC, IF, FACS. These indicate assay contexts where the antibody is commonly applied; actual performance depends on sample type and processing.
Polyclonal reagents can differ in how they recognize epitope features. Monoclonal antibodies often provide more consistent epitope targeting across lots, while polyclonal preparations may broaden recognition across related epitope variants.
Biological background
CK19 / Cytokeratin 19 refers to the gene/protein target stated in the product record. Protein targets can exhibit context-dependent expression, regulated turnover, isoform diversity, and post-translational modifications that affect apparent molecular weight and epitope accessibility. For curated functional annotation, sequence features, and expression context, consult UniProtKB P08727, Ensembl, and Human Protein Atlas.
Research relevance and current trends
- Integrating antibody-based detection with single-cell and spatial atlasing efforts to connect RNA programs with protein-level abundance and localization in defined cell states.
- Expanding multiplexed imaging and high-content screening, where reagent specificity, cross-reactivity risk, and channel design (including direct conjugates) become central to interpretation.
- Growing emphasis on reproducibility and application-specific validation frameworks (e.g., genetic perturbation controls, orthogonal measurements, and independent antibody strategies) when drawing mechanistic conclusions.
Common research applications
- Western blot (WB): commonly used to compare relative abundance/size (e.g., band intensity or mobility shifts) between conditions.
- Immunohistochemistry (IHC): commonly used to compare tissue- and cell-type–specific expression patterns in situ.
- Immunofluorescence (IF): commonly used to compare subcellular localization patterns and redistribution across stimuli or phenotypes.
- FACS: commonly used for qualitative/quantitative detection where compatible with the assay context.
Interpretation typically focuses on relative differences (presence/absence, fold-changes, compartment shifts, or population-level shifts) rather than absolute quantitation. When signal changes are observed, they may reflect altered expression, altered localization/trafficking, changes in modification state, or differences in sample composition; orthogonal readouts and appropriate controls help distinguish these possibilities.
Application details (record-specific): Western blot: 0.1-0.5ug/ml,Immunohistochemisty (FFPE): 0.5-1ug/ml,Immunofluorescence: 5ug/ml,Flow cytometry: 1-3ug/million cells
Application notes (record-specific): Optimal dilution of the CK19 antibody should be determined by the researcher.
Notes for experimental interpretation
- Product description (record-specific): Cytokeratin 19, also called Keratin 19 and CK19, is a protein that in humans is encoded by the KRT19 gene. The protein encoded by this gene is a member of the keratin family. It is specifically expressed in the periderm, the transiently superficial layer that envelops the developing epidermis. The type I cytokeratins are clustered in a region of chromosome 17q12-q21. Due to its high sensitivity, CK19 is the most used marker for the RT-PCR-mediated detection of tumor cells disseminated in lymph nodes, peripheral blood, and bone marrow of breast cancer patients. Keratin 19 is often used together with keratin 8 and keratin 18 to differentiate cells of epithelial origin from hematopoietic cells in tests that enumerate circulating tumor cells in blood.
- Potential confounders: isoforms, proteolytic processing, and PTMs can change epitope presentation and apparent size; fixation/denaturation state can also expose or mask epitopes. Species differences near the epitope may affect cross-reactivity.
- Control concepts: include genetic perturbation (KO/KD) or overexpression comparisons, orthogonal measurement (e.g., transcript or proteomics), and independent antibody/epitope strategies. For conjugated reagents, include staining-only/background controls appropriate to the detection chemistry.
Immunogen/epitope context is described as: Amino acids QLAHIQALISGIEAQLGDVRADSERQNQEYQRLMDIKSR of human KRT19 were used as the immunogen for the CK19 antibody.. Monoclonal and polyclonal formats differ in epitope breadth; this can influence sensitivity to sequence variants, isoforms, or PTM-dependent recognition.
Customization & Add-ons: Can’t find the antibody you need—or require a custom format for your assay? We can help you source the best match or support custom antibody solutions for diverse research needs, including species and isotype selection, conjugations and labeling (e.g., HRP/AP, biotin, fluorophores), purification grade options (Protein A/G, affinity purified), formulation preferences (buffer selection, carrier-free, glycerol-free), custom concentrations and aliquoting, low-endotoxin options for cell-based work, and application-focused QC/validation support (project dependent). Click Talk to a Scientist to submit a request, email us at support@biohippo.com, or explore our Research Services for additional support—our team will follow up with feasibility details and next steps.
