Anti-GBGT1 antibodies are used in the immunodetection of the protein globoside alpha-1,3-N-acetylgalactosaminyltransferase 1 (FORS blood group). In humans, the canonical protein has a reported length of 347 amino acid residues and a mass of 40.1 kDa. Its subcellular localization is in the Golgi. Up to 3 different isoforms have been reported for this protein. It is widely expressed across many tissue types. A member of the Glycosyltransferase 6 protein family, GBGT1 is known to have lost the ability to synthesize Forssman glycolipid antigen (FORS1/FG). Post-translational modifications have been described, including glycosylation. Synonyms for this target antigen include FS, globoside alpha-1,3-N-acetylgalactosaminyltransferase 1, Forssman blood group, Forssman glycolipid synthetase (FS), and A3GALNT. GBGT1 gene orthologs have been reported in the mouse, rat, bovine and chimpanzee species. Immunohistochemistry is the most common application for the GBGT1 antibodies listed below. Western Blot and Immunofluorescence are also common applications.