ID 3.4.21.84 DE limulus clotting factor C. CA Selective cleavage of 103-Arg-|-Ser-104 and 124-Ile-|-Ile-125 bonds in CA Limulus clotting factor B to form activated factor B. Cleavage of -Pro- CA Arg-|-Xaa- bonds in synthetic substrates. CC -!- From the hemocyte granules of the horseshoe crabs Limulus and CC Tachypleus. CC -!- Factor C is activated by Gram-negative bacterial lipopolysaccharides CC and chymotrypsin. CC -!- Inhibited by antithrombin III. CC -!- Belongs to peptidase family S1. DR P28175, CFC_TACTR ; Q26422, LFC_CARRO ; //