Shingen Misaka1, Kenju Shimomura2. 1. Department of Pharmacology, School of Medicine, Fukushima Medical University, 1 Hikarigaoka, Fukushima, 960-1295, Japan. misaka@fmu.ac.jp. 2. Department of Pharmacology, School of Medicine, Fukushima Medical University, 1 Hikarigaoka, Fukushima, 960-1295, Japan.