Affiliation: | Department of Biophysics, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan e-mail: 00hachi@molbio.biophys.kyoto-u.ac.jp Fax: +81-75-753-4198, JP Department of Hygiene, Kansai Medical University, Moriguchi, Osaka 570–8506, Japan, JP
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