a Zn-dependent fibrinolytic enzyme; from the venom of Crotalus basiliscus basiliscus; cleaves the Aalpha-chain of fibrinogen at Lys(413)-Leu(414); Cbfib1.1 and 1.2 also cleave Ser(505)-Thr(506) and Tyr(560)-Ser(561); Cbfib3 also cleaves Gly(204)-Ser(205) and Pro(516)-Met(517)