12245
Membrane-associated lymphotoxin on natural killer cells activates endothelial cells via an NF-kappaB -dependent pathway .
 ( protein: NF-kappaB, None) , ( cell type: natural killer cells, None) , ( protein: Membrane-associated lymphotoxin, None) , ( cell type: endothelial 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:
 ( protein: NF-kappaB, None) , ( cell type: natural killer cells, None) , ( protein: Membrane-associated lymphotoxin, None) , ( cell type: endothelial cells, None) 