7647
Thus, we could trace the deficit of the mutant cells to an inefficient NF-kappaB activation , evidencing a relevant role for NF-kappaB in the regulation of FasL expression in activated T cells .
 ( cell type: mutant cells, None) , ( cell type: activated T cells, None) , ( protein: NF-kappaB, None) , ( protein: NF-kappaB, None) , ( protein: FasL, 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: mutant cells, None) , ( cell type: activated T cells, None) , ( protein: NF-kappaB, None) , ( protein: NF-kappaB, None) , ( protein: FasL, None) 