1. Department of Biomolecular Engineering, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, 4295 Nagatsuta-cho, Midori-ku, Yokohama, 226-8501, Japan; NGK Insulators, Ltd., 1 Maegata-cho, Handa, 467-8530, Japan; and Institute of Industrial Science, University of Tokyo, 7-22-1 Roppongi, Minato-ku, Tokyo, 106-8558, Japan