STYK1 (Serine/threonine/tyrosine kinase 1) is a human putative receptor protein kinase, consist of 422 amino acids. Protein kinases (PKs) represent a well studied but most diverse protein superfamily. The covalent, reversible linkage of phosphate to serine, threonine and tyrosine residues of substrate proteins by protein kinases is probably ubiquitous cellular mechanism for regulation of physiological processes. It is known that most signaling pathways impinge at some point on protein kinases. STYK1 is widely e, Xenopus/Amphibian,pressed in human tissues.