Thrombin-like and fibrinolytic enzymes in the venoms from the Gaboon viper (Bids gabonica), Eastern cottonmouth moccasin (Agkistrodon p. piscivorus) and Southern copperhead (Agkistrodon c. contortrix) snakes - Bajwa, SS; Kirakossian, H; Reddy, KNN; Markland, FS (Toxicon, 1982)