5717
The frequencies of CD8(+) T cells directed against IE-1 were similar to those directed against pp65 in donors tested with known pp65 -derived peptides .
 ( protein: IE-1, None) , ( protein: pp65, None) , ( cell type: CD8(+) T cells, None) , ( protein: pp65, 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: IE-1, None) , ( protein: pp65, None) , ( cell type: CD8(+) T cells, None) , ( protein: pp65, None) 