9015
Part of this process involves the prevention of the development of Th1 cells , which are a primary source of interferon gamma ( IFNgamma ), a potent activator of monocytes and an inhibitor of Th2 proliferation .
 ( protein: interferon gamma, None) , ( cell type: Th1 cells, None) , ( protein: IFNgamma, None) , ( cell type: monocytes, 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: Th1 cells, None) , ( protein: IFNgamma, None) , ( cell type: monocytes, None) 