Alfred L George -
David Mahoney Institute of Neurological Sciences, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104 USA
H David Ledbetter -
Institute for Molecular Genetics, Baylor College of Medicine, Houston, Texas 77030 USA
Roland G Kallen -
David Mahoney Institute of Neurological Sciences, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104 USA
Robert L Barchi -
David Mahoney Institute of Neurological Sciences, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104 USA