7401
Lipopolysaccharide ( LPS ) is a potent stimulator of monocytes and macrophages , causing secretion of tumor necrosis factor alpha ( TNF-alpha ) and other inflammatory mediators .
 ( protein: TNF-alpha, None) , ( protein: tumor necrosis factor alpha, None) , ( cell type: macrophages, None) , ( cell type: monocytes, 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: TNF-alpha, None) , ( protein: tumor necrosis factor alpha, None) , ( cell type: macrophages, None) , ( cell type: monocytes, None) 