4615
Much attention has recently focused on the observation that UV light can activate the long terminal repeat ( LTR ) of the human immunodeficiency virus ( HIV ).
 ( DNA: LTR, 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: LTR, None) , ( DNA: long terminal repeat, None) 