1. Departments of Internal Medicine (D.M., S.A., F.N., N.O.D.), Washington University, St. Louis, Missouri 63110
2. Laboratoire de Biologie Moleculaire et Cellulaire (M.P., J.S.), École Normale Supérieure de Lyon, 69364 Lyon, France
3. Pharmacology and Molecular Biology (N.O.D.), Washington University, St. Louis, Missouri 63110;