2996
Interferon-gamma ( IFN-gamma ) is produced by natural killer cells and certain subsets of T cells , but the basis for its selective expression is unknown.
 ( protein: Interferon-gamma, None) , ( cell type: natural killer cells, None) , ( cell type: T 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: Interferon-gamma, None) , ( cell type: natural killer cells, None) , ( cell type: T cells, None) , ( protein: IFN-gamma, None) 