ID 3.4.21.85 DE limulus clotting factor B. CA Selective cleavage of 98-Arg-|-Ile-99 bond in Limulus proclotting enzyme CA to form active clotting enzyme. CC -!- From the hemocyte granules of the horseshoe crabs Limulus and CC Tachypleus. CC -!- Factor B is activated by factor C. DR Q27081, CFB_TACTR ; Q27083, CFGB_TACTR ; //