7038
Treatment of cells with PD98059 , a specific inhibitor of mitogen-activated protein kinase kinase ( MEK ), inhibited TPA -induced ERK2 activity.
 ( protein: mitogen-activated protein kinase kinase, None) , ( protein: ERK2, None) , ( protein: MEK, 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: mitogen-activated protein kinase kinase, None) , ( protein: ERK2, None) , ( protein: MEK, None) 