7523
These data suggest that, in this inflammatory model , initial activation of NF-kappaB occurs in alveolar macrophages and the ensuing production of TNF-alpha may propagate NF-kappaB activation to other cell types in the lung .
 ( protein: NF-kappaB, None) , ( protein: NF-kappaB, None) , ( protein: TNF-alpha, None) , ( cell type: alveolar macrophages, 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) , ( protein: NF-kappaB, None) , ( protein: TNF-alpha, None) , ( cell type: alveolar macrophages, None) 