Complement Notation C-----complement C1, C2, C3, C5 a-----small fragment C2a, C3a b-----large fragment C2b, C3b, csb activated (enzyme) C1 i---m-inactivated iC3bNotation C-----complement C1, C2, C3, C5 a-----small fragment C2a, C3a b-----large fragment C2b, C3b, C5b ¯ -----activated (enzyme) C1 i-----inactivated iC3b Complement