560
These results demonstrate that the IL-2 NF-chi B site is indispensable for the activity of the IL-2 promoter in EBV-transformed B cells , whereas other transcription factors appear to be less important for IL-2 expression in these cells.
 ( DNA: IL-2 promoter, None) , ( cell line: EBV-transformed B cells, None) , ( cell type: B cells, None) , ( protein: IL-2, None) , ( protein: IL-2, None) , ( protein: transcription factors, None) , ( protein: IL-2, None) , ( DNA: IL-2 NF-chi B site, None) , ( protein: NF-chi B, 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:
 ( DNA: IL-2 promoter, None) , ( cell line: EBV-transformed B cells, None) , ( cell type: B cells, None) , ( protein: IL-2, None) , ( protein: IL-2, None) , ( protein: transcription factors, None) , ( protein: IL-2, None) , ( DNA: IL-2 NF-chi B site, None) , ( protein: NF-chi B, None) 