syk Family Tyrosine Kinase

**Semantic type:** Amino Acid, Peptide, or Protein|Enzyme

**Definition:** The syk family tyrosine kinases are non-receptor protein tyrosine kinases structurally similar to the syk protein (spleen tyrosine kinase) containing two SH2 (SRC homology 2) domains. They play essential roles in a variety of immune and non-immune cells.