13519
Expression of either BZLF1 or BRLF1 triggers expression of the other immediate-early factor , and together these activators act individually or in synergy on downstream targets to activate the viral lytic cycle .
 ( protein: immediate-early factor, None) , ( DNA: downstream targets, None) , ( DNA: BZLF1, None) , ( DNA: BRLF1, 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: immediate-early factor, None) , ( DNA: downstream targets, None) , ( DNA: BZLF1, None) , ( DNA: BRLF1, None) 