8221
IL-2 is required not only for cell cycle progression but also to protect Ag-activated T cells from programmed cell death .
 ( cell type: Ag-activated T cells, 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:
 ( cell type: Ag-activated T cells, None) , ( protein: IL-2, None) 