Complement C4b |
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| C4b Complement; Complement 4b; Complement Component 4b; C4b, Complement; Complement, C4b; Component 4b, Complement | |
| The large fragment formed when COMPLEMENT C4 is cleaved by COMPLEMENT C1S. The membrane-bound C4b binds COMPLEMENT C2A, a SERINE PROTEASE, to form C4b2a (CLASSICAL PATHWAY C3 CONVERTASE) and subsequent C4b2a3b (CLASSICAL PATHWAY C5 CONVERTASE). | |