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The human immunodeficiency virus type 1 long terminal repeat , HIV-1-LTR , contains binding sites for several cellular transcription factors which contribute to HIV-1 gene expression .
 ( DNA: human immunodeficiency virus type 1 long terminal repeat, None) , ( DNA: HIV-1 gene, None) , ( DNA: HIV-1-LTR, 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 long terminal repeat, None) , ( DNA: HIV-1 gene, None) , ( DNA: HIV-1-LTR, None) 