1 Genome Resource and Analysis Unit, RIKEN Center for Developmental Biology, 2-2-3 Minatojima-minami, Kobe 650-0047, Japan
2 Division of Biology, Hyogo College of Medicine, 1-1 Mukogawa-cho, Nishinomiya 663-8501, Japan
3 Evolutionary Morphology Laboratory, RIKEN, 2-2-3 Minatojima-minami, Kobe 650-0047, Japan
4 Phyloinformatics Unit, RIKEN Center for Life Science Technologies, 2-2-3 Minatojima-minami, Kobe 650-0047, Japan