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Hypothalamus levels of DA (a), NE (b), 5-HT (c), 5-HIAA (d), and β-EP (e) in control group (blank bars), CEE group (0.1 mg/kg/d, dark-grey bars), and RRF groups (141, 282, and 564 mg/kg/d, solid-dark bars). Vertical bars represent standard errors of the means, where n = 8. Asterisks designate significant differences: *P < 0.05 versus control group and **P < 0.01 versus control group.
