3110
Only those TCC with low IFN-gamma levels in the absence of IL-12 responded to IL-12 by additional enhancement of IFN-gamma production .
 ( protein: IFN-gamma, None) , ( protein: IFN-gamma, None) , ( cell line: TCC, None) , ( protein: IL-12, None) , ( protein: IL-12, 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) , ( cell line: TCC, None) , ( protein: IL-12, None) , ( protein: IL-12, None) 