CD3 Unconjugated

Overview

CD3 Unconjugated is a Mouse monoclonal targeting CD3, supplied as a Unconjugated format for FC workflows. It supports measurement of Chimpanzee, Human target expression in common experimental systems.

Key elements and design rationale

• Clone: SK7 — consistent clone identity can support panel reproducibility and cross-study comparisons.
• Isotype: IgG1, k — informs selection of matched controls and secondary reagents when relevant.
• Conjugate: Unconjugated — enables direct detection in fluorescence-based assays.
• Host species: Mouse — useful for panel design and control strategy planning.
• Reactivity: Chimpanzee, Human — interpret staining in the context of species-specific sequence and expression differences.

Key specifications such as clone identity, isotype, and fluorophore conjugation help researchers align panel design, control selection, and instrument configuration with the biological question and sample type.

Biological background

The monoclonal SK7 clone recognizes antigen CD3ε epsilon, a 20KDa transmembrane cell-surface protein that belongs to the immunoglobulin superfamily. The CD3 complex contains a CD3γ chain, a CD3δ chain, and two CD3ε chains. These integral membrane protein chains assemble with additional chains of the T cell receptor (TCR), as well as CD3 zeta chain, to form the T cell receptor – CD3 complex. Together with co-receptors CD4 or CD8, the complex serves to recognize antigens bound to MHC molecules on antigen-presenting cells. CD3ε is expressed on T lymphocytes, NK-T cells, and to a varying degree in developing thymocytes. CD3 plays central roles in TCR signaling, T lymphocyte activation, and antigen recognition.

Research relevance and current trends

• High-parameter immunophenotyping: combining CD3 with complementary lineage and activation markers to resolve complex cell states.
• Panel standardization and data comparability: increasing emphasis on consistent reagents, compensation-aware fluorophore choices, and shared gating strategies.
• Integration with single-cell multi-omics: pairing surface marker profiling with transcriptomic or proteomic readouts to connect phenotype to function.

Common research applications

• Flow cytometry: quantify CD3-positive populations and compare expression distributions across conditions or time points.
• Cell sorting: enrich CD3-defined subsets for downstream RNA/protein assays or functional readouts.

Changes in measured signal are typically interpreted in the context of cell subset frequency, activation/differentiation state, and sample processing effects rather than as a standalone readout.

Notes for experimental interpretation

• Fluorophore selection: consider brightness, spectral overlap, and instrument configuration; compensation and spillover can affect apparent population boundaries.
• Biology-driven confounders: activation state, differentiation, and isoform/PTM variation can shift epitope accessibility and apparent expression.
• Control concepts: include matched isotype and fluorescence-minus-one (FMO) controls where appropriate, and interpret results alongside biological positive/negative reference samples.

For antibody-based assays, monoclonal versus polyclonal format can influence epitope recognition breadth and signal consistency. Conjugated antibodies support direct detection and can simplify multicolor panel design when paired with appropriate controls and instrument settings.

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.