Anti-NDUFA3 antibodies are used in the immunodetection of the protein NADH:ubiquinone oxidoreductase subunit A3. In humans, the canonical protein has a reported length of 84 amino acid residues and a mass of 9.3 kDa. Its subcellular localization is in the mitochondria. It is notably widely expressed in many tissue types. A member of the Complex I NDUFA3 subunit protein family, NDUFA3 is reported to be an accessory subunit the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I), that is believed not to be involved in catalysis. Synonyms for this target antigen include CI-B9, NADH dehydrogenase [ubiquinone] 1 alpha subcomplex subunit 3, NADH dehydrogenase (ubiquinone) 1 alpha subcomplex, 3, 9kDa, NADH-ubiquinone oxidoreductase B9 subunit, complex I B9 subunit, and B9. NDUFA3 gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish and chimpanzee species. Some NDUFA3 antibodies may have been used in research and have associated citations. Immunohistochemistry is a widely used application for these antibodies. ELISA and Western Blot are also common applications.