1580
EBV nuclear antigen 2 ( EBNA2 ), one of the first genes expressed after EBV infection of B-cells , is a transcriptional activator of viral and cellular genes and is essential for the transforming potential of the virus .
 ( DNA: cellular genes, None) , ( cell type: B-cells, None) , ( DNA: viral, None) , ( DNA: viral and cellular genes, None) , ( protein: EBNA2, 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: cellular genes, None) , ( cell type: B-cells, None) , ( DNA: viral, None) , ( DNA: viral and cellular genes, None) , ( protein: EBNA2, None) 