1. Department of Nutrition, School of Medicine The University of Tokushima Tokushima 770-8503 Japan
2. National Institute of Neuroscience, National Center of Neurology and Psychiatry Tokyo 187-8502 Japan
3. Department of Physiology and Biophysics University of California Irvine California 92697 USA
4. National Space Development Agency of Japan Tokyo 105-0013 Japan
5. Department of Neuromuscular Research National Center of Neurology and Psychiatry Tokyo 187-8551 Japan
6. Division of Enzyme Chemistry Institute for Enzyme Research, University of Tokushima Tokushima 770-8503 Japan