13969
We demonstrate that, in primary NK cells , IL-13 , but not IL-4 , may induce low levels of IFN-gamma secretion .
 ( protein: IL-13, None) , ( protein: IL-4, None) , ( cell type: primary NK cells, None) , ( protein: IFN-gamma, 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-13, None) , ( protein: IL-4, None) , ( cell type: primary NK cells, None) , ( protein: IFN-gamma, None) 