[1] HARVARD UNIV,SCH MED,DEPT NEUROL NEUROSCI,BOSTON,MA 02115
[2] CHILDRENS HOSP MED CTR,DIV GENET,BOSTON,MA 02115
[3] HARVARD UNIV,SCH MED,DEPT PEDIAT,BOSTON,MA 02115
[4] EUNICE KENNEDY SHRIVER CTR MENTAL RETARDAT INC,DEPT DEV NEUROBIOL,WALTHAM,MA
[5] LJ ROBERTS CTR,INST BIOGERONTOL RES,DIV MORPHOL SCI,SUN CITY,AZ