Jararhagin (EC 3.4.24.73, HF2-proteinase, JF1) is an enzyme. This enzyme catalyses the following chemical reaction Jararhagin (EC 3.4.24.73, HF2-proteinase, JF1) is an enzyme. This enzyme catalyses the following chemical reaction This endopeptidase is present in the venom of the jararaca snake (Bothrops jararaca).