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Cellular and molecular mechanisms of IFN-gamma production induced by IL-2 and IL-12 in a human NK cell line .
 ( cell line: human NK cell line, None) , ( protein: IL-12, None) , ( protein: IFN-gamma, 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:
 ( cell line: human NK cell line, None) , ( protein: IL-12, None) , ( protein: IFN-gamma, None) , ( protein: IL-2, None) 