8695
We previously demonstrated that GRbeta could antagonize GRalpha -mediated transactivation of a glucocorticoid-responsive element (GRE)-driven reporter gene in COS-7 cells .
 ( cell line: COS-7 cells, None) , ( DNA: glucocorticoid-responsive element, None) , ( protein: GRbeta, None) , ( DNA: glucocorticoid-responsive element (GRE)-driven reporter gene, None) , ( protein: GRalpha, 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: COS-7 cells, None) , ( DNA: glucocorticoid-responsive element, None) , ( protein: GRbeta, None) , ( DNA: glucocorticoid-responsive element (GRE)-driven reporter gene, None) , ( protein: GRalpha, None) 