PRIMA, or Proline rich membrane anchor 1, is a human gene encoded by PRIMA1. It may also be known as: Proline-rich membrane anchor 1; PRiMA; membrane anchor of acetylcholinesterase. The encoded protein has an amino acid length of 153 and a mass of 16.7 kDa. Other isoforms may exist. Homologs of this gene exist in other organisms, including: Mouse, Rat, Frog, Chicken.