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We hypothesize that activation of this protein, designated hStat5 , helps govern the biological effects of IL-2 during the immune response .
 ( protein: hStat5, None) , ( protein: IL-2, 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: hStat5, None) , ( protein: IL-2, None) 