1. Institute of Basic Medical Sciences; The University of Tsukuba; Tenōdai 1-1-1, Sakura-mura Ibaraki 305 Japan
2. Division of Pharmacology; National Institute of Radiological Science; Anagawa 4-9-1 Chiba-shi 260 Japan
3. Department of Dermatology; Jichi Medical School, Minamikawachi-machi, Kawachi-gun; Tochigi-ken 329-04 Japan