2269
Some antioxidants , including butylated hydroxyanisole ( BHA ), tetrahydropapaveroline ( THP ), nordihydroguiauretic acid , and 10,11-dihydroxyaporphine ( DHA ), were found to be potent inhibitors of the production of tumor necrosis factor (TNF)-alpha , IL-1 beta , and IL-6 by human peripheral blood mononuclear cells ( PBMC ) stimulated by lipopolysaccharide ( LPS ) ( IC50s in the low micromolar range).
 ( protein: IL-1 beta, None) , ( cell type: human peripheral blood mononuclear cells, None) , ( protein: IL-6, None) , ( protein: tumor necrosis factor (TNF)-alpha, None) , ( cell type: PBMC, 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: IL-1 beta, None) , ( cell type: human peripheral blood mononuclear cells, None) , ( protein: IL-6, None) , ( protein: tumor necrosis factor (TNF)-alpha, None) , ( cell type: PBMC, None) 