The adaptive immune system consists of B and T lymphocytes which mediate humoral immunity (e.g. antibody response) and cell-mediated immunity, respectively. B cell receptor and T cell receptor signaling is responsible for activation of Src family tyrosine kinases, such as Blk, Fyn, and Lyn in B cells and Fyn and Lck in T cells, resulting phosphorylation of the receptor-associated ITAM motifs. Phosphorylated ITAMs serve as the docking sites for Syk family tyrosine kinases, e.g. Syk in B cells and Zap-70 in T cells. Activated Syk kinases then propagate the signals via phosphorylation of downstream proteins. Furthermore, lymphocyte receptor signaling facilitates B and T cell development, differentiation, proliferation and survival.
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