10138
When transcriptionally active, the human immunodeficiency virus ( HIV ) promoter contains a nucleosome-free region encompassing both the promoter /enhancer region and a large region ( 255 nucleotides [nt]) downstream of the transcription start site .
 ( DNA: promoter /enhancer region, None) , ( DNA: 255 nucleotides, None) , ( DNA: transcription start site, None) , ( DNA: promoter, None) , ( DNA: promoter, 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: promoter /enhancer region, None) , ( DNA: 255 nucleotides, None) , ( DNA: transcription start site, None) , ( DNA: promoter, None) , ( DNA: promoter, None) 