1. Molecular Delivery System Laboratory, Department of Biomedical
Engineering, Graduate School of Biomedical Engineering, Tohoku University, 2–1
Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan;
2. Division of Oral Physiology, Graduate School of Dentistry, Tohoku
University, Japan;
3. Tohoku University Hospital, Sendai, Japan; and
4. Department of Pathology, Institute of Development, Aging, and Cancer,
Tohoku University, Japan