obsolete complement component C1s activity (obsolete GO:0003816)
C1 esterase activity
related
C1s esterase activity
related
activated complement C1s
related
complement C1s
related
complement component C1s activity
exact
complement subcomponent C1s
related
OBSOLETE. Catalysis of the cleavage of component C4 to C4a and C4b (Arg-Ala bond), and component C2 to C2a and C2b (Lys-Lys or Arg-Lys bond).