PIH5, or Polypeptide N-acetylgalactosaminyltransferase 15, is a human gene encoded by GALNT15. It may also be known as: Polypeptide GalNAc transferase-like protein 2; GalNAc-T-like protein 2; pp-GaNTase-like protein 2; Polypeptide N-acetylgalactosaminyltransferase-like protein 2; Protein-UDP acetylgalactosaminyltransferase-like protein 2; UDP-GalNAc:polypeptide N-acetylgalactosaminyltransferase-like protein 2; Polypeptide N-acetylgalactosaminyltransferase 15 ; GALNACT15; GALNTL2. The encoded protein is an enzyme with an amino acid length of 639 and a mass of 73.1 kDa. PIH5 is a member of the Glycosyltransferase 2 family, GalNAc-T subfamily. Homologs of this gene exist in other organisms, including: Mouse, Rat.