1. Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX
2. New York State Institute for Basic Research in Developmental Disabilities, George A. Jervis Clinic, Staten Island, NY
3. Nemours Biomedical Research, Alfred I. duPont Hospital for Children, Nemours Children's Clinic, Wilmington, DE
4. Department of Biology, Boston University, Boston, MA
5. Department of Pediatrics, Jefferson Medical College, Philadelphia, PA
6. Department of Neurology and Center of Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI
7. Department of Pediatrics, Baylor College of Medicine, Houston, TX
8. Texas Children's Hospital, Houston, TX
9. Department of Mental Retardation and Birth Defect Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan