1. Enzymology at interfaces and physiology of lipolysis, UPR 9025-CNRS, 31, Chemin Joseph Aiguier, 13402 Marseille Cedex 20, France, Sanofi-Aventis Germany, 65926 Frankfurt am Main, Germany, Istituto di Biochimica delle Proteine, CNR, via P. Castellino 111, 80131 Napoli, Italy, and Laboratoire de Biochimie, Université de Provence, Centre St-Charles, 3 Place V. Hugo, 13331 Marseille Cedex 3, France