A. From left to right, Surface representation of the three-dimensional structures of C3b-MCP (CCP1-4) (blue), C3b-SPICE (CCP1-4) (green), C3b-FH (CCP1-4) (orange), C3b-CR1 (CCP15-17) (dark red), C3b-DAF (CCP2-4) (purple). 