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CD3 antibody | OKT3

Mouse anti Human CD3:APC

Product Type
Monoclonal Antibody

Product Code Applications Pack Size List Price Your Price Qty
Datasheet Datasheet Datasheet
SDS Safety Datasheet SDS
F 100 Tests/0.5ml loader
List Price Your Price

Mouse anti Human CD3 antibody, clone OKT3, recognizes T-cell surface glycoprotein CD3 epsilon chain (CD3ε), also known as T-cell surface antigen T3/Leu-4 epsilon. CD3ε is a subunit within the multiprotein cell surface receptor TCR-CD3 complex, which is expressed on the surface of mature T cells, NKT cells and thymocytes (Mariuzza et al. 2020). The CD3 complex is required for intracellular signaling and for TCR surface expression. Recruitment of the TCR/CD3 complex initiates early events leading to proliferation and differentiation of mature T cells into an effector cell (Guy & Vignali 2009).

Mice that lack the CD3ε gene exhibit early arrest in T cell development and mutation of the gene in humans has been seen to result in severe combined immunodeficiency (SCID) (DeJarnette et al. 1998, de Saint Basile et al. 2004).

Mouse anti Human CD3, clone OKT3 is commonly used in flow cytometry in the phenotyping human T cells. Characterization of the OKT3 clone has shown that it is able to compete and block the binding of the CD3 clones SK7 and UCHT1 to human T cells (Li et al. 2005). The OKT3 clone has also been found to have immunosuppressive properties in vivo. As result of this, the clone was humanized to be used as a therapeutic drug called Muromonomab (Orthoclone). Muromonomab was used as an immunosuppressive including for after solid organ transplants, to prevent the activation of CD4- and CD8- T cells (Wilde & Goa 1996). However, the drug has since been discontinued due to the development of other treatments with similar efficacy and fewer side effects (Reichert 2012).

Target Species
Product Form
Purified IgG conjugated to Allophycyanin (APC) - liquid
Purified IgG prepared by affinity chromatography on Protein G from tissue culture supernatant
Buffer Solution
Phosphate buffered saline
Preservative Stabilisers
0.09% Sodium Azide (NaN3)
Human peripheral blood lymphocytes
>90 % by SDS PAGE
Approx. Protein Concentrations
IgG concentration 0.025 mg/ml
Max Ex/Em
Fluorophore Excitation Max (nm) Emission Max (nm)
APC 650 661
For research purposes only
Guaranteed until date of expiry. Please see product label.

Store at +4°C. DO NOT FREEZE.
This product should be stored undiluted. This product is photosensitive and should be protected from light. Should this product contain a precipitate we recommend microcentrifugation before use.

This product has been reported to work in the following applications. This information is derived from testing within our laboratories, peer-reviewed publications or personal communications from the originators. Please refer to references indicated for further information. For general protocol recommendations, please visit the antibody protocols page.
Application Name Verified Min Dilution Max Dilution
Flow Cytometry 1/8
Where this product has not been tested for use in a particular technique this does not necessarily exclude its use in such procedures. Suggested working dilutions are given as a guide only. It is recommended that the user titrates the product for use in their own system using appropriate negative/positive controls.
Flow Cytometry
Use 5 ul of the suggested working dilution to label 1x106 cells in 100ul

Description Product Code Applications Pack Size List Price Your Price Quantity
Mouse IgG2a Negative Control:APC MCA929APC F 100 Tests
List Price Your Price
Description Mouse IgG2a Negative Control:APC

Entrez Gene
GO Terms
GO:0004888 transmembrane receptor activity
GO:0005057 receptor signaling protein activity
GO:0005887 integral to plasma membrane
GO:0007172 signal complex assembly
GO:0007186 G-protein coupled receptor protein signaling pathway
GO:0009897 external side of plasma membrane
GO:0017124 SH3 domain binding
GO:0019901 protein kinase binding
GO:0030159 receptor signaling complex scaffold activity
GO:0031295 T cell costimulation
GO:0042608 T cell receptor binding
GO:0046982 protein heterodimerization activity
GO:0050852 T cell receptor signaling pathway


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Please Note: All Products are "FOR RESEARCH PURPOSES ONLY"

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