Examples from the Web for thrombin
First, it is found that thrombin becomes converted very quickly into an inactive modification.
The coagulating enzymes, such as thrombin or thrombase (the fibrin ferment) and rennin, which causes the clotting of milk.Dietetics for Nurses|Fairfax T. Proudfit
It is not yet certain what is the nature of the final reaction between fibrinogen and thrombin.
Thrombin, on the other hand, does not exist in living blood, but only makes its appearance there after blood is shed.
The last step in the change is the action of thrombin upon fibrinogen to form fibrin, and the clot is complete.