1. Graduate School of Life Science, Hokkaido University, Sapporo, Japan.
2. Faculty of Sciences, Hokkaido University, Sapporo, Japan.
3. Department of Biology, St. Cloud State University, St. Cloud, MN 56301, USA.
4. Comparative Genomics Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Biopolis, Singapore 138673.
5. Laboratory of Physiology, Atmosphere and Ocean Research Institute, University of Tokyo, Chiba, Japan.
6. Division of Nephrology, Department of Medicine, University of California, San Diego, CA 92093, USA.