ID   3.4.21.42
DE   complement subcomponent C1s.
AN   C1s esterase.
CA   Cleavage of Arg-|-Ala bond in complement component C4 to form C4a and
CA   C4b, and Lys(or Arg)-|-Lys bond in complement component C2 to form C2a
CA   and C2b: the 'classical' pathway C3 convertase.
CC   -!- Activated from proenzyme C1s in plasma by the activated complement
CC       subcomponent C1r.
CC   -!- Belongs to peptidase family S1.
DR   Q0VCX1, C1S_BOVIN  ;  P09871, C1S_HUMAN  ;  Q69DK8, C1S_PIG    ;
DR   Q6P6T1, C1S_RAT    ;  Q8CG14, CS1A_MOUSE ;  Q8CFG8, CS1B_MOUSE ;
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