9772
TCR beta analysis showed that while there was loop length restriction in the putative peptide contact site of all responding beta chains , diverse and unique (non-recurrent) TCR beta clonotypes were selected in individuals during primary infection and continued to emerge after long-term virus exposure .
 ( cell line: unique (non-recurrent) TCR beta clonotypes, None) , ( protein: beta chains, None) , ( DNA: TCR beta, None) , ( cell line: TCR beta clonotypes, 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: unique (non-recurrent) TCR beta clonotypes, None) , ( protein: beta chains, None) , ( DNA: TCR beta, None) , ( cell line: TCR beta clonotypes, None) 