[1] Department of Cell Biology, Swiss Fed. Institute of Technology, ETH-Hönggerberg, 8093 Zürich, Switzerland
[2] Department of Neurobiology, Stanford University, School of Medicine, Stanford, CA 94305, United States
[3] Department of Neuropathology, Stanford University, School of Medicine, Stanford, CA 94305, United States
[4] Department of Neurology, Baylor College of Medicine, Houston, TX 77030, United States
[5] Dept. of Molec. and Human Genetics, Baylor College of Medicine, Houston, TX 77030, United States
[6] Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030, United States
[7] Human Genome Center, Baylor College of Medicine, Houston, TX 77030, United States
[8] Amgen Inc., Thousand Oaks, CA 91320, United States
[9] Montreal Neurological Institute, McGill University, Montreal, Que. H3A 2B4, Canada