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We have investigated the effects of acetylsalicylic acid and sodium salicylate on the LPS -induced synthesis of the pro-coagulant protein tissue factor (TF) and the pro-inflammatory protein tumor necrosis factor-alpha ( TNF-alpha ), as well as the prostaglandin PGE2 in human monocytes .
 ( cell type: human monocytes, None) , ( protein: TNF-alpha, None) , ( protein: prostaglandin PGE2, 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: human monocytes, None) , ( protein: TNF-alpha, None) , ( protein: prostaglandin PGE2, None) 