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Effect of Lactuca sativum hydro-alcoholic extract (HAE) and its fractions on sleep duration in mice. (A) *p < 0.001 vs saline. (B) The animals were treated with 200 mg/Kg of HAE or its water fraction (WF), ethyl acetate fraction (EAF) and n-butanol fraction (NBF). *p < 0.01 vs DMSO. Data represent mean ± SEM of the numbers shown in parentheses.
