13970
When NK cells were costimulated with IL-13 and IL-2 , IL-13 generally resulted in two types of reactivity: IL-13 synergized with IL-2 to stimulate IFN-gamma production or it modestly inhibited IL-2 -mediated IFN-gamma production .
 ( protein: IFN-gamma, None) , ( protein: IFN-gamma, None) , ( protein: IL-13, None) , ( protein: IL-2, None) , ( protein: IL-13, None) , ( cell type: NK cells, None) , ( protein: IL-2, None) , ( protein: IL-2, None) , ( protein: IL-13, 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: IFN-gamma, None) , ( protein: IFN-gamma, None) , ( protein: IL-13, None) , ( protein: IL-2, None) , ( protein: IL-13, None) , ( cell type: NK cells, None) , ( protein: IL-2, None) , ( protein: IL-2, None) , ( protein: IL-13, None) 