1. Laboratory of Histology, Neuroanatomy and Neuropathology, Université Libre de Bruxelles, 808 Route de Lennik, 1070 Brussels, Belgium
2. Department of Neuroscience, Institute of Psychiatry, King's College London, De Crespigny Park, London SE5 8AF, U.K.
3. Laboratory of Pharmacology, Université Catholique de Louvain, Brussels, Belgium
4. Rhône-Poulenc-Rorer, Centre de Recherches de Vitry-Alfortville, Vitry, France