11472
Since the CTL response to virus infection is often focused on one or a few immunodominant epitopes , one approach to circumvent this response is to create vectors that lack these immunodominant epitopes .
 ( protein: immunodominant epitopes, None) , ( cell type: CTL, None) , ( protein: immunodominant epitopes, 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: immunodominant epitopes, None) , ( cell type: CTL, None) , ( protein: immunodominant epitopes, None) 