1. Department of Cell and Molecular Biology (A.M., B.V.), S-171 77 Stockholm, Sweden
2. Department of Clinical Neuroscience (F.U., L.L.), Karolinska Institute, S-171 77 Stockholm, Sweden
3. Noll Physiological Research Center and Department of Cellular and Molecular Physiology (F.U., L.L.), Pennsylvania State University, University Park, Pennsylvania 16802;
4. Department of Human Genetics (D.F.), Mount Sinai School of Medicine, New York, New York 10029