Complement C4b
Synonyms
C4b Complement
C4b, Complement
Complement 4b
Complement Component 4b
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).