1. European Institute of Chemistry and Biology & INSERM E.9929Victor Segalen-Bordeaux 2 University Bordeaux cedex France
2. Max-Planck-Institute for Biochemistry Martinsried Germany
3. Institute of Molecular Biology and Departments of Chemistry and PhysicsUniversity of Oregon Eugene Oregon USA
4. Biochemistry Section, Surgical Neurology BranchNational Institute of Neurological Disorders and StrokeNational Institutes of Health Bethesda Maryland USA