1. From the Howard Hughes Medical Institute, and the Departments of 2Pediatrics,
2. the Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Iowa State University, Ames, Iowa.
3. the Departments of Pediatrics,
4. Molecular Physiology and Biophysics, and
5. Molecular Physiology and Biophysics, and 5Ophthalmology and Visual Sciences, University of Iowa, Iowa City, Iowa; and
6. Ophthalmology and Visual Sciences, University of Iowa, Iowa City, Iowa; and the 3Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Iowa State University, Ames, Iowa.
7. From the Howard Hughes Medical Institute, and 5Ophthalmology and Visual Sciences, University of Iowa, Iowa City, Iowa; and
8. From the Howard Hughes Medical Institute, and the Departments of 2Pediatrics, 5Ophthalmology and Visual Sciences, University of Iowa, Iowa City, Iowa; and