7752
Lipopolysaccharide ( LPS ) stimulation of human neutrophils is known to result in activation of p38 mitogen-activated protein kinase ( MAPk ); however, the upstream activator (s) of p38 MAPk is unknown, and consequences of p38 MAPk activation remain largely undefined.
 ( protein: MAPk, None) , ( protein: upstream activator, None) , ( protein: p38 MAPk, None) , ( cell type: human neutrophils, None) , ( protein: p38 mitogen-activated protein kinase, None) , ( protein: p38 MAPk, 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: MAPk, None) , ( protein: upstream activator, None) , ( protein: p38 MAPk, None) , ( cell type: human neutrophils, None) , ( protein: p38 mitogen-activated protein kinase, None) , ( protein: p38 MAPk, None) 