1. Department of Biotechnology, University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
2. Institute of Molecular and Cellular Biosciences, University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-0032, Japan
3. Faculty of Textile Science and Technology, Shinshu University, Tokida 3-15-1, Ueda-City, Nagano 386-0018, Japan