CREG, or Cellular repressor of E1A stimulated genes 1, is a human gene encoded by CREG1. It may also be known as: Protein CREG1; Cellular repressor of E1A-stimulated genes 1. The encoded protein has an amino acid length of 220 and a mass of 24.1 kDa. Other isoforms may exist. Homologs of this gene exist in other organisms, including: Fly, Rat.