13535
Here, we demonstrate that NK cells induce HLA-DR on the surface of a mutant cell line that is defective in IFN-gamma -induced MHC class II expression .
 ( cell line: mutant cell line, None) , ( protein: HLA-DR, None) , ( cell line: NK cells, None) , ( protein: IFN-gamma, None) , ( protein: MHC class II, 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: mutant cell line, None) , ( protein: HLA-DR, None) , ( cell line: NK cells, None) , ( protein: IFN-gamma, None) , ( protein: MHC class II, None) 