Pw1, or Paternally expressed 3, is a human gene encoded by PEG3. It may also be known as: Paternally-expressed gene 3 protein; Zinc finger and SCAN domain-containing protein 24; PW1; ZKSCAN22; ZNF904; ZSCAN24. The encoded protein has an amino acid length of 1588 and a mass of 180.8 kDa. Pw1 is a member of the Krueppel C2H2-type zinc-finger protein family. Homologs of this gene exist in other organisms, including: Mouse, Rat.