The CD3 antibody, clone SK7, is derived from the hybridization of NS-1 mouse myeloma cells with spleen cells isolated from BALB/c mice immunized with human thymocytes. The CD3 antibody reacts with the epsilon chain of the CD3 antigen/TCR complex. This complex is composed of at least six proteins that range in molecular weight from 20 to 30 kilodaltons (kDa). The antigen recognized by CD3 antibodies is noncovalently associated with either α/β or γ/δ TCR (70 to 90 kDa).
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