6585
Selection and long-term persistence of reactive CTL clones during an EBV chronic response are determined by avidity, CD8 variable contribution compensating for differences in TCR affinities .
 ( cell line: CTL clones, None) , ( protein: TCR, None) , ( protein: CD8, 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: CTL clones, None) , ( protein: TCR, None) , ( protein: CD8, None) 