Anti-ALG3 alpha-1,3- mannosyltransferase antibodies are used for the immunodetection of the protein encoded by the ALG3 gene. In humans, the canonical protein has a reported length of 438 amino acid residues and a mass of 50.1 kDa. Its subcellular localization is in the ER. Alternative splicing is reported to yield 2 different isoforms for this protein. A member of the Glycosyltransferase 58 protein family, it is known to be involved with protein glycosylation. The gene encoding this protein is implicated in Congenital disorder of glycosylation. Other names for this target antigen include CDGS4, CDGS6, D16Ertd36e, NOT56L, Not56, and CDG1D. Gene orthologs have been identified in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species.