557
Similarly, a human immunodeficiency virus promoter , whose activity is controlled through chi B factors , was found to be active in the IL-2 producing EBV- B cells , but inactive in the non- IL-2 -producing cells .
 ( cell line: IL-2 producing EBV- B cells, None) , ( cell line: non- IL-2 -producing cells, None) , ( DNA: human immunodeficiency virus promoter, None) , ( protein: IL-2, None) , ( protein: IL-2, None) , ( protein: chi B factors, None) , ( cell type: B cells, 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 line: IL-2 producing EBV- B cells, None) , ( cell line: non- IL-2 -producing cells, None) , ( DNA: human immunodeficiency virus promoter, None) , ( protein: IL-2, None) , ( protein: IL-2, None) , ( protein: chi B factors, None) , ( cell type: B cells, None) 