14066
The CD8 + CD28 + population showed the same tendency (p < .01-.02).
 ( protein: CD8, None) , ( protein: CD28, 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: CD8, None) , ( protein: CD28, None) 