1. Department of Pediatrics, University of Florida College of Medicine, Gainesville, FL 32610.
2. Powell Gene Therapy Center, University of Florida College of Medicine, Gainesville, FL 32610.
3. Department of Neuroscience, Evelyn F. and William L. McKnight Brain Institute, University of Florida College of Medicine, Gainesville, FL 32610.
4. University of Massachusetts Medical School, Worcester, MA 01655.