11660
Activation of the transcription factor NF-kappaB in lipopolysaccharide -stimulated U937 cells .
 ( protein: NF-kappaB, None) , ( cell line: lipopolysaccharide -stimulated U937 cells, None) , ( protein: transcription factor, 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: NF-kappaB, None) , ( cell line: lipopolysaccharide -stimulated U937 cells, None) , ( protein: transcription factor, None) 