3661
During Epstein-Barr virus latent infection of B lymphocytes in vitro, six viral nuclear antigens ( EBNAs ) are expressed from one of two promoters , Cp or Wp , whose activities are mutually exclusive.
 ( protein: viral nuclear antigens, None) , ( DNA: promoters, None) , ( DNA: Wp, None) , ( cell type: B lymphocytes, None) , ( DNA: Cp, None) , ( protein: EBNAs, 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: viral nuclear antigens, None) , ( DNA: promoters, None) , ( DNA: Wp, None) , ( cell type: B lymphocytes, None) , ( DNA: Cp, None) , ( protein: EBNAs, None) 