1. NSF Center for Biological Timing and Department of Biology, University of Virginia, Charlottesville, VA 22903–2477, USA.
2. Human Genome Center, Institute of Medical Science, University of Tokyo, 4-6-1, Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan.
3. Y.S. New Technology Institute Inc., 519 Shimoishibashi, Ishibashi-machi, Tochigi, 329-0500, Japan.