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I. We, I. Jorquera, D. Chudotvorova, C. Diabira, . K. Pellegrino et al., Hammond for helpful comments on the manuscript; and Sanofi-Synthelabs for the gift of SSR126768A, This work was supported by INSERM, Fondation pour la Recherche Médicale, L'Agence Nationale de la Recherche, Federation pour la Recherche sur le Cerveau and Rotary International, Conseil régional Provence-Alpes-Côte d'Azur, and European Community grant LSHB-CT, 2004.