GP73, or Golgi membrane protein 1, is a human gene encoded by GOLM1. It may also be known as: Golgi membrane protein GP73; Golgi phosphoprotein 2; C9orf155; GOLPH2; HEL46; PSEC0257; bA379P1.3. The encoded protein has an amino acid length of 401 and a mass of 45.3 kDa. Other isoforms may exist. GP73 is a member of the GOLM1/CASC4 family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Frog, Chicken.