Tokyo University of Agriculture and Technology, Faculty of Technology, Department of Biotechnology, Nakacho, Koganei, Tokyo 184-8588, Japan. mitaku@cc.tuat.ac.jp|Tokyo University of Agriculture and Technology, Faculty of Technology, Department of Biotechnology, Nakacho, Koganei, Tokyo 184-8588, Japan. mitaku@cc.tuat.ac.jp|Tokyo University of Agriculture and Technology, Faculty of Technology, Department of Biotechnology, Nakacho, Koganei, Tokyo 184-8588, Japan. mitaku@cc.tuat.ac.jp