665
We have employed the ZEBRA /EBV biological system to test whether a heterologous activation domain can substitute for another activation domain (the ZEBRA domain ).
 ( protein: ZEBRA, None) , ( protein: heterologous activation domain, None) , ( protein: ZEBRA, None) , ( protein: ZEBRA domain, 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: ZEBRA, None) , ( protein: heterologous activation domain, None) , ( protein: ZEBRA, None) , ( protein: ZEBRA domain, None) 