1. Département de Chimie, Laboratoire des Biomolécules (LBM), École Normale Supérieure—PSL Research University, UPMC Univ Paris 06, CNRS 24 rue Lhomond 75005 Paris France
2. Laboratoire des Biomolécules (LBM)Sorbonne Universités, UPMC, Univ Paris 06, Ecole Normale Supérieure, CNRS France
3. Current address: Department of Chemical PhysicsWeizmann Institute of Science Rehovot Israel
4. Current address: Laboratory of Chemical PhysicsNIDDK, NIH Bethesda MD 20892 USA
5. Bruker BioSpin GmbH Silberstreifen 4 76287 Rheinstetten Germany
6. Bruker BioSpin 34 rue de l'Industrie BP 10002 67166 Wissembourg Cedex France
7. Bruker BioSpin AG Industriestrasse 26 8117 Fällanden Switzerland
8. Bruker BioSpin Billerica Massachusetts 01821 USA