Gastrin is a human gene encoded by the symbol, GAST. It may also be known as: Gastrin component I; Gastrin-52; Gastrin-71; preprogastrin; GAS. The encoded protein has an amino acid length of 101 and a mass of 11.4 kDa. Other isoforms may exist. Gastrin is a member of the Gastrin/cholecystokinin family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Frog.