1066
Since most B cell clones immortalized with EBV virus can be induced to produce interleukin-2 , a typical T cell cytokine , we studied the role of different elements of the IL-2 promoter in such clones by transfection.
 ( protein: T cell cytokine, None) , ( DNA: IL-2 promoter, None) , ( protein: interleukin-2, None) , ( cell line: B cell clones, 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: T cell cytokine, None) , ( DNA: IL-2 promoter, None) , ( protein: interleukin-2, None) , ( cell line: B cell clones, None) 