13518
In light of previous work implicating ZEBRA in the activation of Rta , we suggest a cooperative model for EBV entry into the lytic cycle .
 ( protein: Rta, None) , ( protein: ZEBRA, 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: Rta, None) , ( protein: ZEBRA, None) 