769
Large amounts of viral RNA and particles were synthesized in infections established using the tat mutants that contain modified LTRs .
 ( protein: tat mutants, None) , ( DNA: modified LTRs, None) , ( RNA: viral RNA, 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 mutants, None) , ( DNA: modified LTRs, None) , ( RNA: viral RNA, None) 