1. Laboratory for Vertebrate Body Plan, Center for Developmental Biology (CDB), RIKEN Kobe; Kobe Japan
2. Misaki Marine Biological Station, Graduate School of Science; The University of Tokyo; Kanagawa Japan
3. Ultrastructural Research Team, Biosystem Dynamics Group, Division of Bio-function Dynamics Imaging, RIKEN Center for Life Science Technologies (CLST); Kobe Japan
4. Laboratory for Animal Resources and Genetic Engineering, Center for Developmental Biology (CDB), RIKEN Kobe; Kobe Japan