10137
Transcription factor binding sites downstream of the human immunodeficiency virus type 1 transcription start site are important for virus infectivity .
 ( DNA: human immunodeficiency virus type 1 transcription start site, None) , ( protein: Transcription factor, 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: human immunodeficiency virus type 1 transcription start site, None) , ( protein: Transcription factor, None) 