1. Hirabayashi Research Unit, Neuronal Circuit Mechanisms Research Group, and Laboratory for Neuronal Architecture, RIKEN Brain Science Institute, Wako, Saitama 351-0198, Japan, Molecular Characterization Team and Biomolecular Characterization Team, RIKEN, Wako, Saitama 351-0198, Japan, and Core Research for Evolutional Science and Technology (CREST) of Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan