8884
These results define a role for NF-kappaB in mediating FasL expression during T cell activation .
 FasL, NF-kappaB
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:
 FasL, NF-kappaB