title: Activation of C3 via the alternative complement pathway results in fixation of C3b to the pneumococcal cell wall.
mesh_terms: D000818:Animals; D001665:Binding Sites; D002473:Cell Wall / Q000276:immunology; D003167:Complement Activation; D003176:Complement C3; D003179:Complement C3b / Q000378:metabolism; D003168:Complement Fixation Tests; D003170:Complement Pathway, Alternative; D006168:Guinea Pigs; D009895:Opsonin Proteins; D010586:Phagocytes / Q000276:immunology; D013296:Streptococcus pneumoniae / Q000276:immunology*
chemical_list: D003176:Complement C3; D009895:Opsonin Proteins; D003179:Complement C3b