3286
Transient expression assays with plasmids containing deleted parts of the LTR region linked to a reporter gene showed that the NF-kappaB binding site was essential for HIV-1 LTR activity in CD40-stimulated B lymphocytes .
 ( cell line: CD40-stimulated B lymphocytes, None) , ( protein: NF-kappaB, None) , ( DNA: LTR region, None) , ( DNA: HIV-1 LTR, None) , ( DNA: NF-kappaB binding site, 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: CD40-stimulated B lymphocytes, None) , ( protein: NF-kappaB, None) , ( DNA: LTR region, None) , ( DNA: HIV-1 LTR, None) , ( DNA: NF-kappaB binding site, None) 