CytoplasmPlasmaMembraneaggregated IgG,IgM-antigen complex,polyanions, RNA, DNAlipopolysaccharidesProteolytic CleavageC1 complexIonsMembraneattack complexComplexFormationantigen/antibodycomplexPrevents Complement AttackC1qcC6H2OC8aC1rDaf1C8bC1qaMasp1C1sC1qbC2C9HcC7C4aC3C4b