3261
We previously identified and analyzed a 45-nucleotide sequence ( downstream regulatory element 1 [ DRE 1 ]), +195 to +240 , at the boundary of the R/U5 region of the long terminal repeat which is required for HTLV-I basal transcription .
 ( DNA: R/U5 region, None) , ( DNA: 45-nucleotide sequence, None) , ( DNA: long terminal repeat, None) , ( DNA: downstream regulatory element 1, None) , ( DNA: +195 to +240, None) , ( DNA: DRE 1, 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: R/U5 region, None) , ( DNA: 45-nucleotide sequence, None) , ( DNA: long terminal repeat, None) , ( DNA: downstream regulatory element 1, None) , ( DNA: +195 to +240, None) , ( DNA: DRE 1, None) 