1. RIKEN-MIT Center for Neural Circuit Genetics at the Picower Institute for Learning and Memory, Department of Biology and Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA.
2. RIKEN BioResource Center, 3-1-1 Koyadai, Ibaraki 305-0074, Japan.
3. Howard Hughes Medical Institute at MIT, Cambridge, MA 02139, USA.