1957
Both groups showed substantial decreases in mineralocorticoid (MR) and glucocorticoid receptor (GR) levels in the hippocampus , a limbic brain structure critical for HPA axis regulation , whereas GR concentrations in the hypothalamus were unchanged and in anterior pituitary were slightly increased.
 ( protein: GR, 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: GR, None) 