Anti-AAP-S antibodies enable researchers to detect and measure the AAP-S antigen in biological samples. This target is a reported synonym of the NPEPPS gene, which encodes aminopeptidase puromycin sensitive. This protein is known to function in the cellular response to hypoxia and protein ubiquitination, among other biological roles. The human version of AAP-S has a canonical amino acid length of 919 residues and a protein mass of 103.3 kilodaltons, although 2 isoforms have been identified. It is reported to be localized in the nucleus and cytoplasm of cells. This target antigen may also be known as MP100.