Limulus clotting factor B
Limulus clotting factor B is an enzyme. This enzyme catalyses the following chemical reaction:
This enzyme is present in the hemocyte granules of the horseshoe crabs Limulus and Tachypleus. In the immunity-related clotting pathways of these organisms, factor B is downstream of Limulus clotting factor C, but upstream of Limulus clotting enzyme.