13971
In both types of donors, the effect of IL-13 on IL-2 -induced IFN-gamma production was in marked contrast to the strong inhibition seen with IL-4 in NK cells .
 ( protein: IL-4, None) , ( protein: IFN-gamma, None) , ( protein: IL-13, None) , ( cell type: NK cells, None) , ( protein: IL-2, 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-4, None) , ( protein: IFN-gamma, None) , ( protein: IL-13, None) , ( cell type: NK cells, None) , ( protein: IL-2, None) 