Fibrinolytic activity; shows preferential cleavage of Arg-Gly bonds in all three fibrinogen chains. Contact with the caterpillars causes severe bleeding, due the anticoagulant effect of the protein. Sensitive to serine proteinase inhibitors and thiol proteinase inhibitors. Hemolymph and saliva of the larval form (caterpillar). Belongs to the peptidase S1 family.