Anti-N-alpha-acetyltransferase 15, NatA auxiliary subunit antibodies are used for the immunodetection of the protein encoded by the NAA15 gene. In humans, the canonical protein has a reported length of 866 amino acid residues and a mass of 101.3 kDa. Its subcellular localization is in the nucleus and cytoplasm. Alternative splicing is reported to yield 2 different isoforms for this protein. It is notably expressed at high levels in testis and in ocular endothelial cells. It is reported to be an auxillary subunit of N-terminal acetyltransferase complexes which display alpha (N-terminal) acetyltransferase (NAT) activity. Post-translational modifications have been described, including protein cleavage. Other names for this target antigen include NMDA receptor regulated 1, NMDA receptor-regulated protein 1, gastric cancer antigen Ga19, protein tubedown-1, transcriptional coactivator tubedown-100, and N-terminal acetyltransferase. Gene orthologs have been identified in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species.