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.
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Question:  OBJECTIVE : Tumor necrosis factor - alpha ( TNF - alpha ) induces a variety of cellular responses , some of them being at least seemingly contradictory .

Answer: TNF - alpha


Question:  In addition , caspase - 3 , an executioner of apoptosis , was activated and its substrate , poly ( ADP - ribose ) polymerase ( PARP ) , was cleaved during 2 , 2 ' , 4 , 6 , 6 ' - PeCB - induced apoptosis .

Answer: caspase - 3


Question:  Cells scraped off poly - L - lysine in the presence of Ig FITC efficiently incorporated Ig , with relatively uniform fluorescence .

Answer:
Ig FITC