1. Frey Initiative Research Unit; RIKEN Quantitative Biology Center; 2-2-3 Minatojima-minamimachi Chuo-ku Kobe 650-0047 Japan
2. Laboratory for Neocortical Development; RIKEN Center for Developmental Biology; 2-2-3 Minatojima-minamimachi Chuo-ku Kobe 650-0047 Japan
3. Department of Molecular and Cellular Mechanisms of Neurodegeneration; Paul Flechsig Institute of Brain Research; University of Leipzig; Liebigstraβe 19 04103 Leipzig Germany