1. Institute for Advanced Biosciences, Keio University, Tsuruoka, Yamagata 997-0052, Japan
2. Systems Biology Program, Graduate School of Media and Governance, Keio University, Fujisawa, Kanagawa 252-8520, Japan
3. Yamagata Research Institute of Technology, Matsuei, Yamagata 990-2473, Japan
4. Yamagata Integrated Agricultural Research Center, Tsuruoka, Yamagata 999-7601, Japan