1. From the Departments of Ophthalmology,2Cell Biology, and
2. From the Departments of Ophthalmology,
3. Medicine and Center for Human Genetics, Duke University Medical Center, Durham, North Carolina; the
4. Human Genetics Center, University of Texas Health Sciences Center, Houston, Texas; the
5. National Eye Institute, Bethesda, Maryland; and the
6. National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina.