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Effects of GABA/l-theanine mixture on sleep latency (A, C) and sleep duration (B, D) in mice administered with a hypnotic dosage of pentobarbital (42 mg/kg, i.p.). Values are presented as the means ± standard error (SE) for each group, n = 8. Different letters indicate significant differences (p < 0.05) among samples by Tukey’s multiple range test. Symbols indicate significant differences by Bonferroni test, as **p < 0.01, *p < 0.05.
