2580
By using HIV LTR deletion mutants , the NF-kappa B binding sites were found to be critical for response to the pCD41 trans-activation .
 ( DNA: pCD41, None) , ( DNA: HIV LTR, None) , ( DNA: binding sites, None) , ( protein: NF-kappa B, None) , ( DNA: HIV LTR deletion mutants, 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: pCD41, None) , ( DNA: HIV LTR, None) , ( DNA: binding sites, None) , ( protein: NF-kappa B, None) , ( DNA: HIV LTR deletion mutants, None) 