1. Department of Chemistry, Gonda-Goldschmied Medical Research Center, Bar-Ilan University, Ramat-Gan 52900, Israel, Institut fuer Neurobiochemie, Medizinische Fakultaet der Otto von Guericke Universitaet, Leipziger Strasse 44, D-39120 Magdeburg, Germany, and Centre de recherche en Rhumatologie et Immunologie, Université Laval, Sainte-Foy, Québec, Canada