11386
The region downstream of the enhancer ( DEN ) of the long terminal repeat of the mink cell focus-forming murine leukemia virus is important for viral pathogenicity .
 ( DNA: enhancer, None) , ( DNA: DEN, None) , ( DNA: long terminal repeat, 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: enhancer, None) , ( DNA: DEN, None) , ( DNA: long terminal repeat, None) 