Pr1, or Transmembrane protein 37, is a human gene encoded by TMEM37. It may also be known as: Voltage-dependent calcium channel gamma-like subunit; Neuronal voltage-gated calcium channel gamma-like subunit; PR1. The encoded protein has an amino acid length of 190 and a mass of 20.9 kDa. Other isoforms may exist. Pr1 is a member of the PMP-22/EMP/MP20 family, CACNG subfamily. Homologs of this gene exist in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.