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Neuroscience Research Institute and Department of Neurobiology, Peking University Health Science Center, Key Laboratory of Neuroscience, The Ministry of Education and Ministry of Public Health, Beijing 100191, China
*Address: Neuroscience Research Institute, Peking University Health Science Center, 38 Xue Yuan Road, Beijing 100191, China. Tel.: +86 8280 1109; fax: +86 8207 2207.
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Submitted August 12, 2010; revised October 8, 2010; accepted October 12, 2010.