1. Division of Developmental Neurobiology, Graduate School of Medicine, Kobe University, Kobe 650-0017, Japan
2. Division of Systems Medical Science, Institute for Comprehensive Medical Science, Fujita Health University, Toyoake 470-1192, Japan
3. Japan Science and Technology Agency, Core Research for Evolutional Science and Technology, Kawaguchi 332-0012, Japan
4. Department of Organ Anatomy, Graduate School of Medicine, Tohoku University, Sendai 980-8575, Japan
5. Center for Genetic Analysis of Behavior, National Institute for Physiological Sciences, Okazaki 444-8585, Japan
6. Department of Cellular Neurobiology, Brain Research Institute, Niigata University, Niigata 951-8585, Japan