1. Laboratoire de Chimie Organique 2, INSERM U 648, Université Paris-Descartes, 4 avenue de l’Observatoire, 75270 Paris cedex 06, France, CNRS, Protein Phosphorylation & Human Disease Group, Station Biologique, B.P. 74, 29682 Roscoff cedex, Bretagne, France, Department of Pharmacy, University of Athens, GR-15771 Athens, Greece, Laboratory of Molecular & Cellular Neuroscience, The Rockefeller University, 1230 York Avenue, New York, New York 10065-6399