2642
Analysis of truncated LTRs confirmed that inhibition of LTR activation was not mediated through NF-kappa B -binding activity but through the region containing the negative responding elements ( NREs ).
 ( DNA: LTR, None) , ( protein: NF-kappa B, None) , ( DNA: LTRs, None) , ( DNA: negative responding elements, None) , ( DNA: NREs, 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: LTR, None) , ( protein: NF-kappa B, None) , ( DNA: LTRs, None) , ( DNA: negative responding elements, None) , ( DNA: NREs, None) 