补体活化的经典和旁路途径 CLASSICAL PATHWAY Antigen-antibody Activated Clqr2$2- Clqr2s (CD) ale C4-)C )C4b2a CAb2a3b (C3 convertase)/(C5 convertase C3a C3b65-C5b→→→→C5b6789MAC C6 C7 C8 C9 C3a BB (3→C3b Cbbb C3bBb3b (C convertase)(C5 convertase) Microbial surfaces Factor D ALTERNATIVE PATHWAY补体活化的经典和旁路途径