1. Department of Anatomy and Neurobiology; Kyoto Prefectural University of Medicine; Kawaramachi Hirokoji, Kamigyo-ku Kyoto 602-8566 Japan
2. Department of Animal Science, Graduate School of Agricultural Science; Kobe University; 1-1 Rokkodai cho, Nada Kobe 657-8501 Japan
3. Frontier Research Laboratory, Corporate Research and Development Center; Toshiba Corporation; 1 Komukai-Toshiba cho, Saiwai Kawasaki 212-8582 Japan
4. Laboratory of Molecular and Cell Genetics, Graduate School of Biological Sciences; Nara Institute of Science and Technology; 8916-5 Takayama, Ikoma Nara 630-0192 Japan
5. Laboratory of Molecular Oncology, Graduate School of Biological Sciences; Nara Institute of Science and Technology; 8916-5 Takayama, Ikoma Nara 630-0192 Japan
6. Division of Molecular Genetics Research, Life Science Research Center; University of Toyama; 2630 Sugitani Toyama 930-0194 Japan