7754
Although MKK3 , MKK4 , and MKK6 all activated p38 MAPk in experimental models , only MKK3 was found to activate recombinant p38 MAPk in LPS -treated neutrophils.
 ( protein: MKK4, None) , ( protein: p38 MAPk, None) , ( protein: MKK3, None) , ( protein: MKK6, None) , ( protein: MKK3, 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: MKK4, None) , ( protein: p38 MAPk, None) , ( protein: MKK3, None) , ( protein: MKK6, None) , ( protein: MKK3, None) , ( protein: p38 MAPk, None) 