Anti-phospholipase A and acyltransferase 4 antibodies are used for the immunodetection of the protein encoded by the PLAAT4 gene. In humans, the canonical protein has a reported length of 164 amino acid residues and a mass of 18.2 kDa. Its subcellular localization is in the membrane. Alternative splicing is reported to yield 2 different isoforms for this protein. It is widely expressed across many tissue types. A member of the H-rev107 protein family, it is known to be involved with the metabolism of lipids and the regulation of cell proliferation. Other names for this target antigen include HRSL4, PLA1/2-3, RARRES3, RIG1, TIG3, HRAS-like suppressor 4, RAR-responsive protein TIG3, and HRASLS4. Gene orthologs have been identified in the mouse, rat and chimpanzee species.