1. Bio Process Research and Development Laboratories, Production Division; Kyowa Hakko Kirin Company Limited, 100-1 Hagiwara-machi Takasaki Gunma 370-0013 Japan
2. Institute of Medical Science; The University of Tokyo; 4-6-1 Shirokanedai Minato-ku Tokyo 108-8639 Japan
3. Department of Medical Genome Sciences; Graduate School of Frontier Sciences; , The University of Tokyo; Kashiwa 277-8562 Japan
4. Department of Chemistry and Biotechnology; School of Engineering; The University of Tokyo; Tokyo 113-0024 Japan
5. Department of Bioengineering; School of Engineering; The University of Tokyo; Tokyo 113-0024 Japan