title: Reduced immunoglobulin G activates complement system with decreased cooperativity.
mesh_terms: D000478:Alkylation; D003167:Complement Activation; D003171:Complement Pathway, Classical; D003545:Cysteine; D007074:Immunoglobulin G; D007700:Kinetics; D010084:Oxidation-Reduction; D013329:Structure-Activity Relationship
chemical_list: D007074:Immunoglobulin G; D003545:Cysteine