7034
Phorbol ester -induced mononuclear cell differentiation is blocked by the mitogen-activated protein kinase kinase ( MEK ) inhibitor PD98059 .
 ( protein: mitogen-activated protein kinase kinase, 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: MEK, None) 