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Overview of Complement










             Classical Pathway                              Lectin Pathway                           Alternative Pathway


          Antibody binds to specific                    Mannose-binding protein                   Pathogen  surface  creates
          antigen on pathogen surface                   binds pathogen surface                    environment  conducive  to

                                                                                                  complement activation







           Clearance of                                  Complement Activation

           Apoptotic Cells
                                               Formation of C3 and C5 convertases




                                                                                                      Inflammatory response
        Membrane Attack Pathway
        Cytolysis of some pathogens





                  Opsonization & phagocytosis                                                         Clearance of
                  of some pathogens                                                                   Immune complexes



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