6591
TCR affinities were then indirectly estimated by blocking CD8 interaction with an anti-CD8 mAb .
 ( protein: CD8, None) , ( protein: anti-CD8 mAb, None) , ( protein: TCR, 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: anti-CD8 mAb, None) , ( protein: TCR, None) 