1. Department of Molecular Physiological Chemistry (S.K.H., H.T., A.W., M.O.), Osaka University Medical School, Suita, Osaka, 565 Japan
2. Department of Anatomy (O.H.), Nara Medical University, Kashihara, Nara 634, Japan
3. Basic Laboratory Science (Y.N.), Osaka University Medical School, Suita, Osaka, 565 Japan