Anti-ATP synthase membrane subunit j antibodies are used for the immunodetection of the protein encoded by the ATP5MJ gene. In humans, the canonical protein has a reported length of 58 amino acid residues and a mass of 6.7 kDa. Its subcellular localization is in the mitochondria. Alternative splicing is reported to yield 2 different isoforms for this protein. It is a member of the Small mitochondrial proteolipid protein family. Other names for this target antigen include ATP5MPL, C14orf2, MLQ, MP68, PLPM, and 6.8PL. Gene orthologs have been identified in the mouse, rat, bovine, zebrafish, chimpanzee and chicken species.