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The Tat protein of human immunodeficiency virus type 1 ( HIV-1 ) is a potent activator of long terminal repeat -directed transcription .
 ( protein: Tat protein, 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:
 ( protein: Tat protein, None) , ( DNA: long terminal repeat, None) 