Affiliation: | 12nd Department of Anatomy, Kinki University School of Medicine, Sayama-cho, Minami-Kawachi-gun, Osaka 589, Japan 23rd Department of Internal Medicine, Hiroshima University School of Medicine, 1-2-3, Kasumi, Minami-ku, Hiroshima 734Japan 3University Department of Pharmacology, South Parks Road, Oxford OX1 3QTEngland |