8196
The functional synergy between IL-2 and IL-12 is also associated with a prominent increase in STAT1 and STAT3 serine phosphorylation over that observed with IL-12 or IL-2 alone.
 ( protein: IL-12, None) , ( protein: STAT1, None) , ( protein: IL-2, None) , ( protein: IL-12, None) , ( protein: IL-2, None) , ( protein: STAT3, 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: IL-12, None) , ( protein: STAT1, None) , ( protein: IL-2, None) , ( protein: IL-12, None) , ( protein: IL-2, None) , ( protein: STAT3, None) 