1. Graduate School of Chemical Sciences and EngineeringHokkaido University Sapporo 060-8628 Japan
2. Graduate School of EngineeringHokkaido University N13-W8, Kita-ku Sapporo 060-8628 Japan
3. Department of BioscienceFukui Prefectural University Fukui 910-1195 Japan
4. Kyowa Hakko Bio Co. Ltd. 1-6-1, Ohtemachi, Chiyoda-ku Tokyo 100-8185 Japan