1. Department of Bioengineering, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
2. Protein Development Center, Sysmex Corporation, Sayama, Saitama 350-1332, Japan
3. Institute of Medical Science, The University of Tokyo, Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
4. Division of Biological Chemistry and Biologicals, National Institute of Health Sciences, Kanagawa 210-9501, Japan