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.

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

A: Recombinant caspases
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Q:  This distinct biochemical difference between STAT5A and STAT5B was confirmed with purified activated STAT5 recombinant proteins .

A: STAT5 recombinant proteins
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Q:  Previous data suggested a subtle increase in serum P at the time of hCG injection without LH surge reduces the PR of women having oocyte retrievals for IVF ; this study compared PRs of recipients in a shared oocyte program according to the donors ' pre - hCG P level .

A:
pre - hCG
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