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CD3

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CD3 = CD3 disialoganglioside antigen

CD3 is typically expressed on T cells. It is a co-receptor that associates with the T-cell receptor (TCR) complex on the surface of T cells. CD3 is not expressed on other types of lymphocytes, such as B cells or natural killer (NK) cells, which lack the TCR complex.
Ebert 2003 Clin Exp Immunol. 132(3): 424-9