1. Department of Molecular Engineering; Graduate School of Engineering; Kyoto University; Nishikyo-ku Kyoto 615-8510 Japan
2. Institute for Integrated Cell-Material Sciences (WPI-iCeMS); Kyoto University; Sakyo-ku Kyoto 615-8510 Japan
3. Department of Systems Science; Graduate School of Informatics; Kyoto University; Sakyo-ku Kyoto 606-8501 Japan
4. Department of Biophysics; Graduate School of Science; Kyoto University; Sakyo-ku Kyoto 606-8502 Japan
5. Department of Chemistry and Bioengineering; Tampere University of Technology; P. O. Box 541 33101 Tampere Finland
6. Department of Drug Delivery Research; Graduate School of Pharmaceutical Sciences; Kyoto University; Sakyo-ku Kyoto 606-8501 Japan
7. Current address: Department of Biotechnology; Faculty of Engineering; Toyama Prefectural University; 5180 Kurokawa Imizu Toyama 939-0398 Japan