Anti-ATP synthase c subunit lysine N-methyltransferase antibodies are used for the immunodetection of the protein encoded by the ATPSCKMT gene. In humans, the canonical protein has a reported length of 233 amino acid residues and a mass of 26.1 kDa. Its subcellular localization is in the mitochondria. Alternative splicing is reported to yield 2 different isoforms for this protein. It is ubiquitously expressed across many tissue types. It is a member of the ANT/ATPSC lysine N-methyltransferase protein family. Other names for this target antigen include family with sequence similarity 173 member B, protein FAM173B, protein N-lysine methyltransferase FAM173B, and ATP synthase subunit C lysine N-methyltransferase. Gene orthologs have been identified in the mouse, rat, bovine, frog, chimpanzee and chicken species.