Anti-family with sequence similarity 173, member B antibodies enable researchers to detect and measure the family with sequence similarity 173, member B antigen in biological samples. This target is a reported synonym of the ATPSCKMT gene, which encodes ATP synthase c subunit lysine N-methyltransferase. The human version of family with sequence similarity 173, member B has a canonical amino acid length of 233 residues and a protein mass of 26.1 kilodaltons, although 2 isoforms have been identified. It is reported to be localized in the mitochondria of cells. Other names for this target antigen include ATP synthase subunit C lysine N-methyltransferase and family with sequence similarity 173 member B.