Effects of acute atipamezole injection (1 mg/kg, i.p., arrowhead) on extracellular NE levels in microdialysate samples collected from mPFC after CUS exposure. Data expressed as absolute NE levels, measured as pg/sample (mean ± S.E.M.; n = 6–8/group). There were no baseline differences between CUS and control rats before the drug injection, and NE levels were significantly elevated in mPFC following acute atipamezole injection, independent of stress condition (Main effect of Drug, p < 0.02; post hoc comparisons: *p < 0.05 compared to baseline in the same drug-treatment group; +p < 0.01 compared to corresponding time point in the vehicle-injected group).