958
We deduce from these results that EBNA-2 -positive cells might indeed contain specific complexes bound to the LMP promoter which are, however, too labile to be detected in a standard gel retardation assay .
 ( cell line: EBNA-2 -positive cells, None) , ( protein: specific complexes, None) , ( DNA: LMP promoter, None) , ( protein: EBNA-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:
 ( cell line: EBNA-2 -positive cells, None) , ( protein: specific complexes, None) , ( DNA: LMP promoter, None) , ( protein: EBNA-2, None) 