1. Section on Cellular Differentiation, Program on Developmental Endocrinology and Genetics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD;
2. Division of Pediatric Endocrinology, Department of Pediatrics, Glycogen Storage Disease Program, University of Florida, Gainesville, FL; and
3. Foundation Fighting Blindness, Columbia, MD