3424
Down-regulation of immunogenic proteins ( EBNA2-EBNA6 ) in nasal lymphoma may enable tumour cells to evade host cytotoxic T-cell surveillance .
 ( protein: EBNA2-EBNA6, None) , ( protein: immunogenic proteins, None) , ( cell type: tumour cells, 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: EBNA2-EBNA6, None) , ( protein: immunogenic proteins, None) , ( cell type: tumour cells, None) 