Human a1-proteinase inhibitor

Human a1-proteinase inhibitor --> a1-antitrypsin

a glycoprotein that is the major protease inhibitor of human serum, is synthesised in the liver, and is genetically polymorphic due to the presence of over 20 alleles; individuals appropriately homozygous are deficient in a1-trypsin and are predisposed to pulmonary emphysema and juvenile hepatic cirrhosis because of alterations in the amino acid and sialic acid components of the glycoprotein. A1-antitrypsin also inhibits thrombin.

Synonym: a1-trypsin inhibitor, human a1-proteinase inhibitor.

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