1. Department of Pathology MSC08-4640, University of New Mexico, 2325 Camino de Salud NE, CRF225, Albuquerque, NM 87131, USA
2. Departments of Structural Biology and Physical Biochemistry, Max Planck Institute for Molecular Physiology, 44227 Dortmund, Germany
3. Sanofi-Aventis, Centre de Recherche Paris, 13, Quai Jules Guesde–BP 14, 94403 Vitry sur Seine Cedex, France