1. From the Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, Massachusetts; the
2. Division of Neuroscience, Oregon National Primate Research Center and3Departments of Medicine and4Ophthalmology, Oregon Health and Science University, Portland, Oregon;
3. DSM Nutrition Ltd. (formerly Roche Vitamins Ltd.), Basel, Switzerland; and
4. Schepens Eye Research Institute, Department of Ophthalmology and7Program in Neuroscience, Harvard Medical School, Boston, Massachusetts.