9565
IL-2 and T cell antigen receptor complex induction of STAT3alpha serine 727 phosphorylation is dependent on the activity of the MEK /ERK pathway .
 ( protein: /ERK, None) , ( protein: T cell antigen receptor complex, None) , ( protein: IL-2, None) , ( protein: MEK, None) , ( protein: STAT3alpha, 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: /ERK, None) , ( protein: T cell antigen receptor complex, None) , ( protein: IL-2, None) , ( protein: MEK, None) , ( protein: STAT3alpha, None) 