768
It was found that the propagation of the Tat mutants containing wild-type LTRs was less efficient than that of the LTR-modified Tat mutants .
 ( DNA: wild-type LTRs, None) , ( protein: Tat, None) , ( protein: Tat, None) , ( protein: LTR-modified Tat mutants, None) , ( protein: Tat mutants, 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: wild-type LTRs, None) , ( protein: Tat, None) , ( protein: Tat, None) , ( protein: LTR-modified Tat mutants, None) , ( protein: Tat mutants, None) 