[1] RIKEN Ctr Dev Biol, Lab Cell Asymmetry, Chuou Ku, Kobe, Hyogo 6500047, Japan
[2] RIKEN Ctr Dev Biol, Lab Anim Resources & Genet Engn, Chuou Ku, Kobe, Hyogo 6500047, Japan
[3] RIKEN Ctr Dev Biol, Lab Neuronal Differentiat & Regenerat, Chuou Ku, Kobe, Hyogo 6500047, Japan