1. Laboratory for Developmental Neurobiology, Brain Science Institute, RIKEN, Saitama 351-0198, Japan
2. Division of Molecular Neurobiology, The Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan
3. Calcium Oscillation Project, ICORP, Japan Science and Technology Corporation (JST), Tokyo 108-0071, Japan
4. Department of Pediatrics, Tokyo Women's Medical University, Tokyo 162-8666, Japan