the small lysis of autologous artificial thrombi of rabbits by human urokinase may be caused by ( 1 ) low affinity of human urokinase for rabbit plasminogen , ( 2 ) weak adsorption of human urokinase to rabbit fibrin , ( 3 ) phagocytosis of human urokinase by leukocytes and ( 4 ) high level of antifibrinolytic activity of rabbit plasma .
C0015982
fibrin
C0032105
plasma