3887
Reverse transcription-PCR analysis showed that all seven EBV -positive tumour tissues constitutively expressed EBV nuclear antigen ( EBNA ) 1 mRNA , but not EBNA2 mRNA .
 ( RNA: EBNA2 mRNA, None) , ( RNA: EBV nuclear antigen ( EBNA ) 1 mRNA, None) , ( protein: EBV nuclear antigen, None) , ( protein: EBNA, 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:
 ( RNA: EBNA2 mRNA, None) , ( RNA: EBV nuclear antigen ( EBNA ) 1 mRNA, None) , ( protein: EBV nuclear antigen, None) , ( protein: EBNA, None) 