Complement C2a

**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).

**Tree numbers:** - D12.776.124.486.274.150.500

**Synonyms:** - C2a Complement - Complement 2a - Complement C2 Fragment a - Complement C2a Fragment