1. Division of Child Neurology, Department of Neurology, University of California at San Francisco, San Francisco, California 94143;
2. Research Center for Genetic Medicine, Children's National Medical Center, Washington, District of Columbia 20010; Departments of
3. Veterinary Biomedical Sciences,
4. Department of Biological Sciences, State University of New York at Buffalo, Buffalo, New York 14260-1300
5. Statistics, and
6. Veterinary Pathobiology, University of Missouri at Columbia, Columbia, Missouri 65211; and