1459
Because inhibition of DNA-binding activity is associated with increasing intracellular glutathione disulfide levels and GSSG can be shown to inhibit the DNA-binding activity directly in cell-free systems , our studies suggest that GSSG is a physiologically relevant inhibitor in intact cells also.
 ( protein: GSSG, None) , ( protein: GSSG, None) , ( cell type: intact cells, 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: GSSG, None) , ( protein: GSSG, None) , ( cell type: intact cells, None) 