In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.

[EX Q]:  In this study , we sought to determine the specific effect of HIV protease inhibitors on patient weight .
[EX A]: HIV protease

[EX Q]:  Recombinant caspases are typically produced in Escherichia coli expression systems with the attendant problems of solubilization , re - folding and activation of the protease .
[EX A]: Recombinant caspases

[EX Q]:  As much thrombin was formed during cardiopulmonary bypass ( measured by the prothrombin activation fragment F1 + 2 and thrombin - antithrombin complexes ) as in normal patients , showing that factor XII was not necessary for thrombin generation .
[EX A]:
factor XII