MeSH definition : The COOH-terminal fragment of COMPLEMENT 2, released by the action of activated COMPLEMENT
C1S. It is a SERINE PROTEASE. C2a combines with COMPLEMENT C4B to form C4b2a (CLASSICAL
PATHWAY C3 CONVERTASE) and subsequent C4b2a3b (CLASSICAL PATHWAY C5 CONVERTASE).;
The COOH-terminal fragment of COMPLEMENT 2, released by the action of activated COMPLEMENT
C1S. It is a SERINE PROTEASE. C2a combines with COMPLEMENT C4B to form C4b2a (CLASSICAL
PATHWAY C3 CONVERTASE) and subsequent C4b2a3b (CLASSICAL PATHWAY C5 CONVERTASE).