title: Complement and host defence against microorganisms.
mesh_terms: D001665:Binding Sites; D003167:Complement Activation; D003176:Complement C3 / Q000276:immunology; D003179:Complement C3b / Q000276:immunology; D003165:Complement System Proteins / Q000172:deficiency / Q000235:genetics / Q000276:immunology*; D006801:Humans; D007239:Infections / Q000276:immunology*; D016177:Macrophage-1 Antigen; D009895:Opsonin Proteins / Q000276:immunology; D010586:Phagocytes / Q000276:immunology; D011951:Receptors, Complement / Q000276:immunology; D013329:Structure-Activity Relationship
chemical_list: D003176:Complement C3; D016177:Macrophage-1 Antigen; D009895:Opsonin Proteins; D011951:Receptors, Complement; D003179:Complement C3b; D003165:Complement System Proteins