5941
Furthermore, expression of physiological levels of Bcl-x protected B cells from Fas-mediated apoptosis in the absence of NF-kappaB signaling .
 ( cell type: Bcl-x protected B cells, None) , ( protein: Bcl-x, None) , ( protein: NF-kappaB, None) , ( cell type: B cells, 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: Bcl-x protected B cells, None) , ( protein: Bcl-x, None) , ( protein: NF-kappaB, None) , ( cell type: B cells, None) 