Anti-N-alpha-acetyltransferase 40, NatD catalytic subunit antibodies are used for the immunodetection of the protein encoded by the NAA40 gene. In humans, the canonical protein has a reported length of 237 amino acid residues and a mass of 27.2 kDa. Its subcellular localization is in the nucleus and cytoplasm. Alternative splicing is reported to yield 3 different isoforms for this protein. It is reported to be widely expressed, with the highest expression level in the liver and the lowest expression in the brain. A member of the Acetyltransferase protein family, it is a reported N-alpha-acetyltransferase that specifically mediates the acetylation of the N-terminal residues of histones H4 and H2A. Other names for this target antigen include N(alpha)-acetyltransferase 40, NatD catalytic subunit, homolog, N-acetyltransferase 11 (GCN5-related, putative), N-alpha acetyl transferase 40, and N-alpha-acetyltransferase 40. Gene orthologs have been identified in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species.