2942
Since T cells normally express Bcl-2 and Bcl-xL following activation, their inability to block Fas -mediated apoptosis may allow for the elimination of self-reactive cells and the appropriate regulation of immune responses .
 ( protein: Bcl-xL, None) , ( cell type: T cells, None) , ( cell type: self-reactive cells, None) , ( protein: Bcl-2, None) , ( protein: Fas, 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: Bcl-xL, None) , ( cell type: T cells, None) , ( cell type: self-reactive cells, None) , ( protein: Bcl-2, None) , ( protein: Fas, None) 