title: Inhibition of the enzymatic activity of the first component of complement (C1) by heparin.
mesh_terms: D000799:Angioedema / Q000097:blood; D000818:Animals; D002199:Capillary Permeability / Q000187:drug effects; D002642:Chick Embryo; D003172:Complement C1 / Q000378:metabolism; D003174:Complement C1 Inactivator Proteins; D003175:Complement C2 / Q000378:metabolism; D003181:Complement C4 / Q000378:metabolism; D003169:Complement Inactivator Proteins; D006168:Guinea Pigs; D006493:Heparin / Q000494:pharmacology*; D006801:Humans; D007700:Kinetics
chemical_list: D003172:Complement C1; D003174:Complement C1 Inactivator Proteins; D003175:Complement C2; D003181:Complement C4; D003169:Complement Inactivator Proteins; D006493:Heparin