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We have shown that interleukin-1 ( IL-1 ) and IL-2 control IL-2 receptor alpha ( IL-2R alpha ) gene transcription in CD4-CD8- murine T lymphocyte precursors .
 ( protein: interleukin-1, None) , ( protein: IL-1, None) , ( protein: IL-2R alpha, None) , ( protein: IL-2 receptor alpha, None) , ( DNA: IL-2 receptor alpha ( IL-2R alpha ) gene, None) , ( protein: IL-2, None) , ( cell line: CD4-CD8- murine T lymphocyte precursors, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: interleukin-1, None) , ( protein: IL-1, None) , ( protein: IL-2R alpha, None) , ( protein: IL-2 receptor alpha, None) , ( DNA: IL-2 receptor alpha ( IL-2R alpha ) gene, None) , ( protein: IL-2, None) , ( cell line: CD4-CD8- murine T lymphocyte precursors, None) 