SEARCH Articles Figures Tables Alternate pathway complement cascade Alternative pathway complement Alternative pathway, of complement Alternative pathway, of complement activation Classic pathway, complement Classic pathway, of complement activation Classical pathway of complement Classical pathway of complement activation Complement Complement activation alternate pathway Complement activation alternative pathway Complement activation classical pathway Complement classical pathway Complement lectin pathway Complement proteins/system activation pathways Complement system activation pathways Complement system alternative pathway Complement system classic pathway Complement system classical pathway Complement, activity, pathway Complementation The Number of Proteins Participating in a Pathway Is Known through Genetic Complementation Analysis