Ppyr1, or Neuropeptide Y receptor Y4, is a human gene encoded by NPY4R. It may also be known as: Neuropeptide Y receptor type 4; NPY4-R; Pancreatic polypeptide receptor 1; PP1; PPYR1. The encoded protein has an amino acid length of 375 and a mass of 42.2 kDa. Ppyr1 is a member of the G-protein coupled receptor 1 family. Homologs of this gene exist in other organisms, including: Fly, Rat, Frog.