The complement C1 inhibitor controls the activation of the C1 comple, Xenopus/Amphibian, by forming a proteolytically inactive stoichiometric comple, Xenopus/Amphibian, with the C1r or C1s proteases. This process regulates important physiological pathways including complement activation, blood coagulation, fibrinolysis and the generation of kinins. Deficiencies in C1 inhibitor cause hereditary angiodema (HAE/HANE), a disorder characterized by episodic local subcutaneous edema and submucosal edema involving the upper respiratory and gastrointestinal tracts. This antibody recognizes human complement C1 inhibitor by ELISA.