Anti-CEL antibodies are used in the immunodetection of the protein carboxyl ester lipase. In humans, the canonical protein has a reported length of 753 amino acid residues and a mass of 79.3 kDa. It has been described to be a secreted protein. Up to 2 different isoforms have been reported for this protein. It is notably expressed in the stomach, pancreas, and lactating breast. A member of the Type-B carboxylesterase/lipase protein family, CEL is known to catalyze the hydrolysis of a wide range of substrates including cholesteryl esters, phospholipids, lysophospholipids, di- and tri-acylglycerols, and fatty acid esters of hydroxy fatty acids (FAHFAs). Synonyms for this target antigen include BSDL, BSSL, CELL, CEase, FAP, FAPP, LIPA, and BAL. CEL gene orthologs have been reported in the mouse, rat, bovine, zebrafish, chimpanzee and chicken species. Some CEL antibodies may have been used in research and have associated citations. Immunohistochemistry is a widely used application for these antibodies. ELISA and Western Blot are also common applications.