Effects of daily AMPH on the expression of hypothalamic NPY, Y1R, c-Fos, and c-Jun over a 4-day period. Upper panel: the results of Western Blot. Lower panel: relative densitometric values for Western Blot in control and 2 mg/kg AMPH-treated groups. Contents of protein in AMPH-treated groups were indicated as the percentage of the control group. Bars are the means ± SEM. N = 8 each group. * p < 0.05 vs. control. #p < 0.05 vs. the AMPH-treated groups.