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 .
 Bcl-xL, T cells, self-reactive cells, Bcl-2, Fas
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 Bcl-xL, T cells, self-reactive cells, Bcl-2, Fas