1. Department of Molecular Biology; Graduate School of Medical Sciences; Kyushu University; 3-1-1 Maidashi Higashi-ku Fukuoka 812-8582 Japan
2. Laboratory of Biological Diversity; National Institute for Basic Biology; Department of Basic Biology; School of Life Science; Graduate School of Advanced Studies; Nishigonaka 38 Myodaiji Okazaki Aichi 444-8585 Japan
3. Laboratory for Amphibian Biology; Graduate School of Science; Hiroshima University; Higashihiroshima Hiroshima 739-8526 Japan
4. Center for Faculty Development; Okayama University; Tsushima-naka 2-1-1 Kita-ku Okayama 700-8530 Japan