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:  Simultaneous exposure to PPAR - gamma ligands ( e . g . 15 - deoxy - Delta ( 12 , 14 ) - prostaglandin J ( 2 ) , troglitazone ) showed drastic inhibition of proliferation and significant decreases in cell viability .

A: PPAR - gamma
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Q:  Calcineurin , a Ca ( 2 + ) / calmodulin - dependent Ser / Thr phosphatase ( protein phosphatase 2B ) , plays a critical role in IL - 2 production during T cell activation .

A: IL - 2
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Q:  The role of the chemokine binding stromal - derived factor 1 ( SDF - 1 ) in normal human megakaryopoiesis at the cellular and molecular levels and its comparison with that of thrombopoietin ( TPO ) have not been determined .

A:
SDF - 1
****