1499
Transcriptional differences between these LTRs were further enhanced by two- to threefold upon treatment of cells with phorbol ester or tumor necrosis factor alpha or by cotransfection with plasmids expressing NF kappa B subunits.
 ( DNA: plasmids, None) , ( protein: NF kappa B, None) , ( protein: tumor necrosis factor alpha, None) , ( DNA: LTRs, 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: plasmids, None) , ( protein: NF kappa B, None) , ( protein: tumor necrosis factor alpha, None) , ( DNA: LTRs, None) 