Anti-N-alpha-acetyltransferase 25, NatB auxiliary subunit antibodies are used for the immunodetection of the protein encoded by the NAA25 gene. In humans, the canonical protein has a reported length of 972 amino acid residues and a mass of 112.3 kDa. Its subcellular localization is in the cytoplasm. Alternative splicing is reported to yield 2 different isoforms for this protein. A member of the MDM20/NAA25 protein family, it is reported to be a non-catalytic subunit of the NatB complex which catalyzes acetylation of the N-terminal methionine residues of peptides beginning with Met-Asp, Met-Glu, Met-Asn and Met-Gln. Other names for this target antigen include mitochondrial distribution and morphology 20, natB complex subunit MDM20, and N-terminal acetyltransferase B complex subunit NAA25. Gene orthologs have been identified in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species.