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We have recently shown that infection of Epstein-Barr virus ( EBV ) genome-positive B cells by human herpesvirus 6 ( HHV-6 ) results in the expression of the immediate-early EBV Zebra gene , followed by virus replication (L.Flamand, I.Stefanescu, D.V.Ablashi, and J.Menezes, J.Virol.67:6768-6777, 1993).
 ( cell line: Epstein-Barr virus ( EBV ) genome-positive B cells, None) , ( cell type: B cells, None) , ( DNA: immediate-early EBV Zebra gene, 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:
 ( cell line: Epstein-Barr virus ( EBV ) genome-positive B cells, None) , ( cell type: B cells, None) , ( DNA: immediate-early EBV Zebra gene, None) 