Src, Yes, Fyn, and Fgr make up the SrcA subfamily, while Lck, Hck, Blk, and Lyn belong to the SrcB subfamily, and Frk has its own subfamily. The Src family kinase (SFK) family of non-receptor tyrosine kinases has nine members in total. Src-family kinases (SFKs) have been identified as important immune cell regulators of numerous intracellular signaling pathways.Src-family kinases (SFKs) participate in a number of signaling transduction cascades, including those originating from integrins, growth factor receptors, T and B cell antigen receptors, and Fc receptors. Src-family kinases (SFKs) can play both positive and negative regulatory roles in cellular signaling.By phosphorylating immunoreceptor tyrosine-based inhibitory motifs (ITIMs) on inhibitory receptors, they can attract and activate inhibitory molecules like the phosphatases SHP-1 and SH2 containing 5′ inositol phosphatase (SHIP-1) and act as negative regulators of cellular signaling.
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