Fibrin(ogen)olytic serine protease degrades Bbeta-chain of human fibrinogen (FGB) and shows a lower activity on Aa-chain (FGA). Also degrades fibrin directly. Releases fibrinopeptide B and a small amount of fibrinopeptide A. Has also be shown to catalyze the hydrolysis of some chromogenic substrates such as S2238, S2160, S2302 and S2251. Inhibited by PMSF and soybean trypsin inhibitor. Partially inhibited by DTT and cysteine. Not affected by EDTA. Monomer. Expressed by the venom gland. Does not show coagulant activity. Does not show activity on gamma-chain of fibrinogen (PubMed:11306131, PubMed:12091097). Does not activate Lys-plasminogen. Does not show hemorrhagic activity. Neither causes rabbit platelet aggregation nor inhibits platelet aggregation induced by ADP and collagen (PubMed:11306131). Its molecular weight is estimated to be 32000. Belongs to the peptidase S1 family. Snake venom subfamily.