1. E. Welker, G. Bronchti, F. Gheorghita-Baechler, R. Dubois, H. Van der Loos, Institute of Anatomy, University of Lausanne, Rue du Bugnon 9, 1005 Lausanne, Switzerland.
2. M. Armstrong-James, Department of Physiology, Queen Mary and Westfield College, London E1 4NS, United Kingdom.
3. W. Ourednik, Department of Anatomy and Neurobiology, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4H7.
4. D. L. Guernsey, Division of Molecular Pathology and Molecular Genetics, Department of Pathology, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4H7.
5. P. E. Neumann, Department of Anatomy and Neurobiology, and Division of Molecular Pathology and Molecular Genetics, Department of Pathology, Dalhousie University, Halifax, Nova Scotia, Canada, B3H 4H7.