PIM, or Pim-1 proto-oncogene, serine/threonine kinase, is a human gene encoded by PIM1. It may also be known as: Serine/threonine-protein kinase pim-1; Serine/threonine-protein kinase pim-1 . The encoded protein is an enzyme with an amino acid length of 404 and a mass of 45.4 kDa. Other isoforms may exist. PIM is a member of the Protein kinase superfamily, CAMK Ser/Thr protein kinase family, PIM subfamily. Homologs of this gene exist in other organisms, including: Fly, Frog.