1. Department of Ophthalmology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104.
2. Veterinary Molecular Biology Laboratory, Montana State University-Bozeman, Bozeman, MT 59717-3610.
3. Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, OH 44195.
4. Departments of Ophthalmology and Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104.