2770
Additionally, IFN-gamma activity but not IL-1 , IL-2 , or IL-4 activity was present in culture supernatants 72 h after R24 stimulation .
 ( protein: IFN-gamma, None) , ( protein: R24, 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: R24, None) 