1. Biomacromolecules Research Team, RIKEN Center for Sustainable Resource Science, Wako, Saitama 351-0198, Japan
2. Center for Bioscience Research & Education, Utsunomiya University, Tochigi 321-8505, Japan
3. Laboratory for Biomaterial Chemistry, Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan