11504
The negative regulatory element ( NRE ) of the hepatitis B virus ( HBV ) core promoter contains three subregions which act synergistically to suppress core promoter activity .
 ( DNA: negative regulatory element, None) , ( DNA: hepatitis B virus ( HBV ) core promoter, None) , ( DNA: NRE, 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: negative regulatory element, None) , ( DNA: hepatitis B virus ( HBV ) core promoter, None) , ( DNA: NRE, None) 