1. Department of Anatomy and Cell Biology; Faculty of Medicine; Nara Medical University; Kashihara Nara 634-8521 Japan
2. Department of Morphological Brain Science; Graduate School of Medicine; Kyoto University; Kyoto 606-8501 Japan
3. Department of Biology; School of Medicine; Aichi Medical University; Yazako Nagakute Aichi 480-1195 Japan