Affiliation: | Department of Cell Biology, Tokyo Metropolitan Institute of Gerontology, 35-2 Sakae-cho, Itabashi-ku, Tokyo 173, Japan, JP Institute for Medical and Dental Engineering, Tokyo Medical and Dental University, 2-3-10 Surugadai-Kanda, Chiyoda-ku, Tokyo 101, Japan, JP Department of Neurosurgery, School of Medicine, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113, Japan, JP
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