PTK7 encodes the human gene, Protein tyrosine kinase 7 (inactive). It may also be known as: Inactive tyrosine-protein kinase 7; CCK-4; Protein-tyrosine kinase 7; Pseudo tyrosine kinase receptor 7; Tyrosine-protein kinase-like 7; Colon carcinoma kinase 4; CCK4. The encoded protein has an amino acid length of 1070 and a mass of 118.4 kDa. Other isoforms may exist. PTK7 is a member of the Protein kinase superfamily, Tyr protein kinase family, Insulin receptor subfamily. Homologs of this gene exist in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.