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Human peripheral blood lymphocytes were observed to contain several IL-2 -inducible DNA binding activities .
 ( protein: IL-2, None) , ( cell type: Human peripheral blood lymphocytes, 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-2, None) , ( cell type: Human peripheral blood lymphocytes, None) 