11204
To extend these initial observations, we have examined the effect of antioxidant treatment on the activity of the mitogen-activated protein kinases erk1 and erk2 , as members of a signal transduction pathway known to directly regulate transcription factor function .
 ( protein: erk1, None) , ( protein: erk2, None) , ( protein: mitogen-activated protein 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: erk1, None) , ( protein: erk2, None) , ( protein: mitogen-activated protein kinases, None) 