participates_in complement activation, alternative pathway complement activation, classical pathway complement receptor 1 recognition C3b 2009-11-23T02:17:58Z C3b is the principal protein fragment produced when complement component C3 is cleaved by convertases of either the classical or alternative pathway. C3b aids in opsonization. IDOMAL:0000581 IDOMAL:0000581 complement component 3b guest idomal_namespace human host protein complement activation, alternative pathway complement activation, classical pathway complement receptor 1 recognition C3b 2009-11-23T02:17:58Z C3b is the principal protein fragment produced when complement component C3 is cleaved by convertases of either the classical or alternative pathway. C3b aids in opsonization. IDOMAL:0000581 IDOMAL:0000581 complement component 3b guest idomal_namespace