3573
These extrathymic T-cell populations include cells expressing elevated levels of V beta T-cell receptors that are normally deleted in thymic development .
 ( cell type: extrathymic T-cell populations, None) , ( protein: V beta T-cell receptors, 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 type: extrathymic T-cell populations, None) , ( protein: V beta T-cell receptors, None) 