1. Division of Bioengineering and Bioinformatics, Graduate School of Information Science and Technology, Hokkaido University, North 14, West 9, Kita-ku, Sapporo, 060-0814, Japan
2. Laboratory of Radiation Biology, Graduate School of Veterinary Medicine, Hokkaido University, North 18, West 9, Kita-ku, Sapporo, 060-0818, Japan
3. Central Institute of Isotope Science, Hokkaido University, North 15, West 7, Kita-ku,Sapporo, 060-0815, Japan
4. N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, 9, Ac. Lavrentieva Ave., Novosibirsk, 630090, Russia
5. Department of Biochemistry and In Vivo Multifunctional Magnetic Resonance Center, West Virginia University, Robert C. Byrd Health Sciences Center, 1 Medical Center Drive, Morgantown, West Virginia 26506, United States