1. Department of Anesthesiology and Critical Care Medicine, Yokohama City University Graduate School of Medicine, Yokohama 236-000 4, Japan.
2. Department of Applied Pathobiology, Yokohama City University Graduate School of Medicine, Yokohama 236-0004, Japan.
3. Laboratory of Molecular Genetics, Institute of Medical Science, University of Tokyo, Tokyo 108-0071, Japan.