1. F. M. Kirby Center for Molecular Ophthalmology, Scheie Eye Institute, University of Pennsylvania, Philadelphia, PA 19104, USA.
2. Center for Cellular and Molecular Therapeutics, Children’s Hospital of Philadelphia, Abramson Pediatric Research Center, Philadelphia, PA 19014, USA.
3. Howard Hughes Medical Institute, Philadelphia, PA 19104, USA.
4. Nonhuman Primate Research Program, University of Pennsylvania, Department of Pathology and Laboratory Medicine, Gene Therapy Program, Translational Research Laboratories, Philadelphia, PA 19104-3402, USA.
5. Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
6. Developmental Biology Program for Pediatric Disorders, Children’s Hospital of Philadelphia, Philadelphia, PA 19104, USA.
7. College of Veterinary Medicine and Mason Eye Institute, University of Missouri-Columbia, Columbia, MO 65212, USA.
8. Departments of Ophthalmology and Visual Sciences and Pathology, University of Iowa, Iowa City, IA 52242-1007, USA.
9. Scheie Eye Institute, University of Pennsylvania, Philadelphia, PA 19104, USA.