1. Department of Ophthalmology, Harvard Medical School and the Massachusetts Eye and Ear Infirmary, Boston, MA 02114
2. Department of Neurobiology, Stanford University School of Medicine, Stanford, CA 94305
3. Zilkha Neurogenetic Institute, Beckman Macular Research Center, Doheny Eye Institute
4. Departments of Ophthalmology and Cell and Neurobiology, Keck School of Medicine of the University of Southern California, Los Angeles, CA 90089
5. Center for Neuroscience and Department of Psychiatry and Behavioral Sciences, University of California, Davis, CA 95616
6. Division of Biology, California Institute of Technology, Pasadena, CA 91125