¹ From the Department of Experimental Pathology, Scripps Clinic and Research Foundation, La Jolla, California 92037

A method has been described for the chemical modification of human C'2 which results in a pronounced enhancement of its hemolytic activity and a marked increase in the stability of the intermediate complex EAC'1a,4,2a prepared with the modified C'2. Both effects are fully explained by the observed increase in activity and stability of the C'3 converting enzyme, C'4,2a, following its generation with modified C'2. Evidence has been presented in support of the hypothesis that the modification resulting from treatment of C'2 with a critical concentration of iodine consists of oxidation of one or more sulfhydryl group within the molecule.

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