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This technique was successfully applied to evaluate differences in glucocorticoid receptor expression in U937 cells before and after the addition of potent differentiation inducers : 12-O-tetradecanoylphorbol 13-acetate ( TPA ) and a combination of all-trans retinoic acid ( RA ) and 1,25-dihydroxyvitamin D2 ( VD ).
 ( cell line: U937 cells, None) , ( protein: glucocorticoid receptor, 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: U937 cells, None) , ( protein: glucocorticoid receptor, None) 