1. Laboratoire de Biochimie Génétique (Professor Kamoun), J. E. CNRS 34623, Hôpital Necker, 75743 Paris Cedex 15, France.
2. Laboratory of Central Nervous System Studies, National Institute of Neurological and Communicative Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892.
3. INSERM U.161, 75014 Paris, France.
4. CHRU Le Milétrie, 86021 Poitiers, France. J. de Grouchy, INSERM U.173 and U.K 119 CNRS, Hôpital Necker, 75743 Paris Cedex 15, France.