Drs. Acosta
Palacio, Sarampote, Russell, Berg, Arcos-Burgos, and Muenke, Ms. Bolton, Ms. Balog, Ms. Eagen, Ms. Nee, and Ms. Jones are with the National Human Genome Research Institute, National Institutes of Health, Bethesda, MA: and Dr. Castellanos is with the New York University Child Study Center