1. Division of Developmental Genetics, Institute of Molecular Embryology and Genetics, Kumamoto University, Kumamoto 862-0976, Japan
2. Department of Orthopaedic Surgery, Kumamoto University School of Medicine, Kumamoto 860-8556, Japan
3. Division of Transgenic Technology, Institute of Resource Development and Analysis, Kumamoto University, Kumamoto 860-0811, Japan
4. Division of Reproductive Engineering, Institute of Resource Development and Analysis, Kumamoto University, Kumamoto 860-0811, Japan
5. Department of Cell Pathology, Kumamoto University School of Medicine, Kumamoto 860-8556, Japan
6. Division of Bioinformatics, Institute of Resource Development and Analysis, Kumamoto University, Kumamoto 860-0811, Japan
7. Institute of Developmental Genetics, GSF-National Research Center for Environment and Health, 85764 Neuherberg, Germany and
8. Technology Development Team for Mammalian Cellular Dynamics, BioResource Center, RIKEN, Tsukuba, Ibaraki 305-0074 Japan