1. Laboratory for Cell Asymmetry, RIKEN Center for Developmental Biology; Kobe Japan
2. Department of Anatomy, Kawasaki Medical School; Kurashiki Japan
3. Optical Image Analysis Unit, RIKEN Center for Developmental Biology; Kobe Japan
4. Department of Biology, Ochanomizu University; Tokyo Japan
5. Cell Architecture Laboratory, Center for Frontier Research, National Institute of Genetics; Shizuoka Japan