1. Department of Otolaryngology-Head and Neck Surgery; Jichi Medical University School of Medicine; Shimotsuke; Tochigi; Japan
2. Division of Cell and Molecular Medicine; Center for Molecular Medicine; Jichi Medical University School of Medicine; Shimotsuke; Tochigi; Japan
3. Department of Anatomy; Jichi Medical University School of Medicine; Shimotsuke; Tochigi; Japan
4. Department of Physiology II; Kinki University School of Medicine; Osaka-sayama City; Japan
5. Laboratory of Anatomy and Cell Biology; Department of Neuroscience Basic Technology; Tokyo Metropolitan Institute for Neuroscience; Fuchu; Tokyo; Japan