8925
Taken together, our results suggest that IFN-alpha , IL-2 , IL-12 , and IL-15 have overlapping activities on human T cells .
 ( protein: IL-15, None) , ( cell type: human T cells, None) , ( protein: IL-2, None) , ( protein: IL-12, None) , ( protein: IFN-alpha, 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: IL-15, None) , ( cell type: human T cells, None) , ( protein: IL-2, None) , ( protein: IL-12, None) , ( protein: IFN-alpha, None) 