Anti-glucosaminyl (N-acetyl) transferase 4 antibodies are used for the immunodetection of the protein encoded by the GCNT4 gene. In humans, the canonical protein has a reported length of 453 amino acid residues and a mass of 53.1 kDa. Its subcellular localization is in the Golgi. It is reported to be highly expressed in the thymus. A member of the Glycosyltransferase 14 protein family, it is a reported glycosyltransferase that mediates core 2 O-glycan branching, an important step in mucin-type biosynthesis. Post-translational modifications have been described, including glycosylation. Other names for this target antigen include LINC01336, beta-1,3-galactosyl-O-glycosyl-glycoprotein beta-1,6-N-acetylglucosaminyltransferase 4, core 2 beta-1,6-N-acetylglucosaminyltransferase 3, and C2GNT3. Gene orthologs have been identified in the mouse, rat, bovine, frog, chimpanzee and chicken species.