1. Department of Agricultural Biotechnology; Seoul National University; 1 Gwanak-Ro, Gwanak-Gu Seoul 151-742 Republic of Korea
2. Division of Magnetic Resonance; Korea Basic Science Institute; Ochang Chungbuk 363-883 Republic of Korea
3. Department of Bioscience and Biotechnology; Shinshu University, Ina; Nagano 399-4598 Japan
4. Institute for Biomedical Sciences, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University; Matsumoto Nagano 390-8621 Japan