ATC Group: B06AC01 C1-inhibitor, plasma derived

C1 inhibitor is a single chain glycoprotein found in plasma and a member of the serine protease inhibitor, or serpin, superfamily of proteins. C1 inhibitor inhibits the complement system by binding C1r and C1s and is the most important inhibitor of contact activation, regulating the contact system and the intrinsic coagulation pathway by binding to and inactivating kallikrein and factor XIIa.