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The fyn-related kinase (FRK) belongs to the tyrosine kinase family of protein kinases and is also named as PTK5(protein-tyrosine kinase 5), RAK(Nuclear tyrosine protein kinase). The Frk is a tyrosine kinase expressed in various tissues, such as the gastrointestinal tract and pancreatic islet cells. It affects pancreatic beta cell number during embryogenesis and promotes beta cell cytotoxic signals in response to streptozotocin(PMID:20157399). It may function as a tumor suppressor(PMID:19345329).