Abstract
A traditional Chinese medicine, Shimotsu-to, consisting of four herbs: Japanese angelica root, cnidium rhizome, peony root and rehmannia root, has been reported to improve spatial working memory in rats. The present results indicate that Paeoniflorin and tetramethylpyrazine (TMP) extracted from peony root and cnidium rhizome, respectively, are candidates for cognitive enhancer.
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