Atrolysin C (EC 3.4.24.42, Crotalus atrox metalloendopeptidase c, hemorrhagic toxin c and d) is an enzyme. This enzyme catalyses the following chemical reaction Atrolysin C (EC 3.4.24.42, Crotalus atrox metalloendopeptidase c, hemorrhagic toxin c and d) is an enzyme. This enzyme catalyses the following chemical reaction This endopeptidase is present in the venom of the western diamondback rattlesnake (Crotalus atrox).