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:  In contrast , vaccination with a peptide encoding an adenovirus type 5 ( Ad5 ) E1A CTL epitope results in CTL tolerance and enhanced growth of an Ad5 E1A - expressing tumor .

A: Ad5 E1A
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Q:  It has been previously reported that IL - 2 release in activated Jurkat T requires caspase - like activity ( Posmantur et al . ( 1998 ) Exp . Cell . Res . 244 , 302 - 309 ) .

A: IL - 2
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Q:  Cells in G0 , G1a and G1b phases , where the G1a - G1b transition is an Interleukin 2 dependent event , were quantitated by flow cytometry .

A:
Interleukin 2
****