Thrombin-like snake venom protein that release fibrinopeptide A from fibrinogen (FGA). Shows both kinin-releasing and coagulant activities. Selective cleavage of Arg-|-Xaa bond in fibrinogen, to form fibrin, and release fibrinopeptide A. The specificity of further degradation of fibrinogen varies with species origin of the enzyme. Monomer. Expressed by the venom gland. N-glycosylated: contains mannose, galactose, N-acetylglucosamine, and fucose. Belongs to the peptidase S1 family. Snake venom subfamily.