1. Department of Cardiovascular MedicineOsaka University Graduate School of Medicine Suita Osaka 565‐0871
2. Department of BiochemistryOsaka University Graduate School of Medicine Suita Osaka 565‐0871
3. Department of Physiology (II)The Jikei University School of Medicine Tokyo 105‐8461 Japan
4. Samuel Lunenfeld Research InstituteMount Sinai Hospital Toronto Ontario Canada M5G‐1X5
5. Department of Neuropathology and NeuroscienceGraduate School of Pharmaceutical SciencesUniversity of Tokyo Tokyo 113‐0033 Japan