2555
In most HIV-1 isolates in which this PU box was not conserved, it was replaced by a binding site for the related factor Ets1 .
 ( DNA: PU box, None) , ( protein: Ets1, None) , ( DNA: binding site, 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: PU box, None) , ( protein: Ets1, None) , ( DNA: binding site, None) 