C1qT252 (a) Ciq C122 Antibody Fc
(b) C4a C4 C2 C2b 4b 2a C4b2a (C3 convertase)
(c) C3a C3a C3a 3 3b 3b C3. 4b 2a 3b C4b2a3b (C5 convertase)
(a) n C4b2a S- B C3 (b) (c) Cell membrane 0 R C3a C田 Os 0 c C SH ” P Activated C3b Bound C3b
(d) C5a C5 C5b 4邱 2a 3b