253
The signal is subsequently propagated through the activation of Raf-1 , MEK , and MAP kinases as shown by their increased autophosphorylation in vitro and phosphorylation in situ.
 ( protein: MEK, None) , ( protein: Raf-1, None) , ( protein: MAP kinases, 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: MEK, None) , ( protein: Raf-1, None) , ( protein: MAP kinases, None) 