1 RIKEN Center for Brain Science, 2-1 Hirosawa, Wako, Saitama 351-0106, Japan. Electronic address: [email protected].
2 Department of Anatomy and Molecular Cell Biology, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550, Japan; Division of Multicellular Circuit Dynamics, National Institute for Physiological Sciences, National Institute of Natural Sciences, 38 Nishigonaka, Myodaiji-cho, Okazaki 444-8585, Japan; Center of Optical Scattering Image Science, Kobe University, Rokkodai 1-1, Nada, Kobe 657-8501, Japan. Electronic address: [email protected].