PSG4 encodes the human gene, Pregnancy specific beta-1-glycoprotein 4. It may also be known as: Pregnancy-specific beta-1-glycoprotein 4; PSBG-4; Pregnancy-specific glycoprotein 4; PS-beta-G-9; PS-beta-G-4; PSG9. The encoded protein has an amino acid length of 419 and a mass of 47.1 kDa. PSG4 is a member of the Immunoglobulin superfamily, CEA family. Homologs of this gene exist in other organisms, including: Fly, Rat.