Summary
Inhibition of tissue activator purified from human heart by urokinase inhibitor purified
from human placenta was observed by both the fibrin plate method and fibrin clot lysis
time method. It was shown to be of much less on extent in comparison with urokinase,
that is, 20 Ploug units of urokinase were completely inhibited by approximately 100
or 200 u of urokinase inhibitor in the respective methods but 6 Ploug units of tissue
activator were inhibited only 25% to 50% even though 1,000 u of urokinase inhibitor
were used.