Anti-PNPO antibodies are used in the immunodetection of the protein pyridoxamine 5'-phosphate oxidase. In humans, the canonical protein has a reported length of 261 amino acid residues and a mass of 30 kDa. Up to 4 different isoforms have been reported for this protein. It is ubiquitously expressed across many tissue types. A member of the Pyridoxamine 5'-phosphate oxidase protein family, PNPO is known to catalyze the oxidation of either pyridoxine 5'-phosphate (PNP) or pyridoxamine 5'-phosphate (PMP) into pyridoxal 5'-phosphate (PLP). Synonyms for this target antigen include PDXPO, pyridoxine-5'-phosphate oxidase, epididymis secretory protein Li 302, epididymis secretory sperm binding protein, and HEL-S-302. PNPO gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species. Some PNPO antibodies may have been used in research and have associated citations. Western Blot is a widely used application for these antibodies. In addition, Immunohistochemistry is also a common application.