MeSH definition : A serum protein that regulates the CLASSICAL COMPLEMENT ACTIVATION PATHWAY. It binds
as a cofactor to COMPLEMENT FACTOR I which then hydrolyzes the COMPLEMENT C4B in the
CLASSICAL PATHWAY C3 CONVERTASE (C4bC2a).;
A serum protein that regulates the CLASSICAL COMPLEMENT ACTIVATION PATHWAY. It binds
as a cofactor to COMPLEMENT FACTOR I which then hydrolyzes the COMPLEMENT C4B in the
CLASSICAL PATHWAY C3 CONVERTASE (C4bC2a).