Anti-abhydrolase domain containing 4, N-acyl phospholipase B antibodies are used for the immunodetection of the protein encoded by the ABHD4 gene. In humans, the canonical protein has a reported length of 342 amino acid residues and a mass of 38.8 kDa. Alternative splicing is reported to yield 2 different isoforms for this protein. A member of the Peptidase S33 protein family, it is known to be involved with the metabolism of lipids. Other names for this target antigen include (Lyso)-N-acylphosphatidylethanolamine lipase, abhydrolase domain-containing protein 4, alpha/beta hydrolase domain-containing protein 4, alpha/beta-hydrolase 4, and ABH4. Gene orthologs have been identified in the mouse, rat, bovine, frog, zebrafish and chimpanzee species.