6588
To address this question, we took advantage of a panel of CD8+ T cell clones from the joint of a rheumatoid arthritis patient and selected for their reactivity against a single MHC/peptide complex .
 ( cell line: CD8+ T cell clones, None) , ( protein: single MHC/peptide complex, 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: CD8+ T cell clones, None) , ( protein: single MHC/peptide complex, None) 