771
Thus, despite its essential role for releasing an elongation block , Tat is not otherwise absolutely required for synthesis of full-length HIV transcripts and assembly of virus particles .
 ( protein: Tat, None) , ( RNA: full-length HIV transcripts, None) , ( protein: elongation block, 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, None) , ( RNA: full-length HIV transcripts, None) , ( protein: elongation block, None) 