1. Oxygen Biology Laboratory, Medical Research Institute, Tokyo Medical and Dental University (TMDU), Bunkyo-ku, Tokyo 113-8510, Japan
2. Department of Pharmacology, School of Medicine, Asahikawa Medical University, Asahikawa, Hokkaido 078-8510, Japan
3. Cell Biology of Genomes Group, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892
4. Department of Clinical Biostatistics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Bunkyo-ku, Tokyo 113-8510, Japan