Medical Dictionary
serpin
noun ser·pin \ˈsir-pən, ˈser-\
Medical Definition of SERPIN
: any of a group of structurally related proteins that typically are serine protease inhibitors (as antithrombin and antitrypsin) whose inhibiting activity is conferred by an active site in a highly variable and mobile peptide loop and that include some (as ovalbumin and angiotensinogen) which have apparently lost the inhibitory action due to mutation in the course of evolutionary change
Origin of SERPIN
serine proteinase inhibitor
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