Liver carboxylesterase 1 also known as carboxylesterase 1 (CES1, hCE-1 or CES1A1) is an enzyme that in humans is encoded by the CES1gene.[5][6] The protein is also historically known as serineesterase 1 (SES1), monocyte esterase and cholesterol esterhydrolase (CEH). Three transcript variants encoding three different isoforms have been found for this gene.[6] The various protein products from isoform a, b and c range in size from 568, 567 and 566 amino acids long, respectively.
CES1 is present in most tissues with higher levels in the liver and low levels in the gastrointestinal tract.[7]
^Imai T (Jun 2006). "Human Carboxylesterase Isozymes: Catalytic Properties and Rational Drug Design". Drug Metabolism and Pharmacokinetics. 21 (3): 173–185. doi:10.2133/dmpk.21.173. PMID16858120.