Anti-IDO2 antibodies are used in the immunodetection of the protein indoleamine 2,3-dioxygenase 2. In humans, the canonical protein has a reported length of 420 amino acid residues and a mass of 47.1 kDa. Up to 2 different isoforms have been reported for this protein. It is notably expressed in the liver, small intestine, spleen, placenta, thymus, lung, brain, kidney, and colon. A member of the Indoleamine 2,3-dioxygenase protein family, IDO2 is known to catalyze the first and rate limiting step of the catabolism of the essential amino acid tryptophan along the kynurenine pathway. Synonyms for this target antigen include indoleamine 2,3-dioxygenase-like protein 1, indoleamine-pyrrole 2,3 dioxygenase-like 1, indoleamine-pyrrole 2,3-dioxygenase-like protein 1, and indoleamine 2,3-dioxygenase-like 1 protein. IDO2 gene orthologs have been reported in the mouse, rat, bovine, frog, chimpanzee and chicken species.