Latexin (LXN) ,a member of the protease inhibitor I47 (latexin) family, is also known as endogenous carboxypeptidase inhibitor (ECI), tissue carboxypeptidase inhibitor (TCI) and protein MUM, which is highly expressed in heart, prostate, ovary, kidney, pancreas and colon, moderate or low in other tissues including brain. LXN is hardly reversible, non-competitive, and a potent inhibitor of CPA1, CPA2 and CPA4. LXN may play a role in inflammation as well.