14534
Since induction of the IL-2 receptor alpha subunit is a hallmark of lymphocyte activation , we suggest that p21ras naturally triggers B cell activation .
 ( cell type: B cell, None) , ( protein: p21ras, None) , ( protein: IL-2 receptor alpha subunit, None) , ( cell type: lymphocyte, 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: B cell, None) , ( protein: p21ras, None) , ( protein: IL-2 receptor alpha subunit, None) , ( cell type: lymphocyte, None) 