1. From the Scheie Eye Institute, Department of Ophthalmology, University of Pennsylvania, Philadelphia, Pennsylvania; the
2. Department of Ophthalmology, Hadassah-Hebrew University Medical Center, Jerusalem, Israel; the
3. Department of Genetics and the Rappaport Family Institute for Research in the Medical Sciences, Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel; the
4. Howard Hughes Medical Institute and Department of Ophthalmology, University of Iowa Carver College of Medicine, Iowa City, Iowa; the
5. Department of Otolaryngology, University of Miami, Miami, Florida; and the
6. Usher Syndrome Center, Boys Town National Research Hospital, Omaha, Nebraska.