1. Department of Pediatrics, Powell Gene Therapy Center, University of Florida, Gainesville, FL 32610.
2. Department of Physiology and Functional Genomics, McKnight Brain Institute, and Powell Gene Therapy Center, University of Florida, Gainesville, FL 32610.
3. Department of Pediatrics, School of Medicine, University of Pittsburgh, Children's Hospital of Pittsburgh, Pittsburgh, PA.
4. Biochemical Genetics Laboratory, Division of Laboratory Genetics, Department of Laboratory Medicine and Pathology, Mayo Clinic College of Medicine, Rochester, MN.