Anti-PTPA antibodies are used in the immunodetection of the protein protein phosphatase 2 phosphatase activator. In humans, the canonical protein has a reported length of 358 amino acid residues and a mass of 40.7 kDa. Its subcellular localization is in the nucleus and cytoplasm. Up to 4 different isoforms have been reported for this protein. It is widely expressed across many tissue types. A member of the PTPA-type PPIase protein family, PTPA is known to be involved with the regulation of apoptosis. Synonyms for this target antigen include PPP2R4, PR53, serine/threonine-protein phosphatase 2A activator, PP2A phosphatase activator, and PP2A. PTPA gene orthologs have been reported in the mouse, rat, bovine, frog, zebrafish, chimpanzee and chicken species. A number of PTPA antibodies have been mentioned in research publications and have associated citations. Western Blot is a widely used application for these antibodies. ELISA and Immunohistochemistry are also common applications.