12329
The lung macrophage was identified as the main cellular source for critical inflammatory mediators such as tumor necrosis factor-alpha , the chemokines interleukin (IL) -8 and -6 , and matrix metalloproteinase-9 in this model system of mechanical ventilation .
 ( protein: chemokines, None) , ( protein: inflammatory mediators, None) , ( cell type: lung macrophage, None) , ( protein: tumor necrosis factor-alpha, None) , ( protein: matrix metalloproteinase-9, 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: chemokines, None) , ( protein: inflammatory mediators, None) , ( cell type: lung macrophage, None) , ( protein: tumor necrosis factor-alpha, None) , ( protein: matrix metalloproteinase-9, None) 