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Amyloid β (Aβ) peptides produced from the amyloid precursor protein, a transmembrane protein, are neurotoxic and blocking the neurotoxicity may lead to prevention of Alzheimer's disease (AD). Here we tested whether Aβ25-35-induced cognitive decline is rescued by treatment with dehydroeffusol, a phenanthrene isolated from Chinese medicine Juncus effusus. Dehydroeffusol (5 ~ 15 mg/kg body weight) was orally administered to mice for 6 days and Aβ25-35 (2 mM) was injected at the rate of 1 μl/min for 3 min into the lateral ventricle. Y-maze test was performed af