Institute of Science and Technology Austria, Klosterneuburg, Austria.|Institut de la Vision, INSERM U968, UPMC, CNRS U7210, CHNO Quinze-Vingts, Paris, France , Department of Molecular Biology, Princeton Neuroscience Institute, Princeton University, Princeton, New Jersey, United States of America.|Department of Molecular Biology, Princeton Neuroscience Institute, Princeton University, Princeton, New Jersey, United States of America , Joseph Henry Laboratories of Physics, Princeton University, Princeton, New Jersey, United States of America.|Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel.|Joseph Henry Laboratories of Physics, Princeton University, Princeton, New Jersey, United States of America , Lewis-Sigler Institute for Integrative Genomics, Princeton University, Princeton, New Jersey, United States of America.|Department of Molecular Biology, Princeton Neuroscience Institute, Princeton University, Princeton, New Jersey, United States of America.