Anti-BCAT1 antibodies are used in the immunodetection of the protein branched chain amino acid transaminase 1. In humans, the canonical protein has a reported length of 386 amino acid residues and a mass of 43 kDa. Its subcellular localization is in the cytoplasm. Up to 5 different isoforms have been reported for this protein. A member of the Class-IV pyridoxal-phosphate-dependent aminotransferase protein family, BCAT1 is known to catalyze the first reaction in the catabolism of the essential branched chain amino acids leucine, isoleucine, and valine. Synonyms for this target antigen include BCT1, ECA39, MECA39, PNAS121, PP18, and BCATC. BCAT1 gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species.