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In the present study we analyzed the control of IL-2 promoter activity in Epstein-Barr virus ( EBV )-transformed B cell clones which are capable of secreting IL-2 at a low level after stimulation with phorbol 12-myristate 13-acetate and the Ca2+ ionophore ionomycin .
 ( protein: IL-2, None) , ( DNA: IL-2 promoter, None) , ( cell line: Epstein-Barr virus ( EBV )-transformed B cell clones, 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: IL-2, None) , ( DNA: IL-2 promoter, None) , ( cell line: Epstein-Barr virus ( EBV )-transformed B cell clones, None) , ( protein: IL-2, None) 