913
Mutations of the AML1- or LBF4- binding sites had no effect on EBNA-2 transactivation , whereas mutation of the PU.1 -binding site completely eliminated EBNA-2 responses .
 ( protein: PU.1, None) , ( protein: EBNA-2, None) , ( DNA: PU.1 -binding site, None) , ( protein: EBNA-2, 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: PU.1, None) , ( protein: EBNA-2, None) , ( DNA: PU.1 -binding site, None) , ( protein: EBNA-2, None) 