1. Institute for Organic Chemistry and Chemical Biology, Center for
Biomolecular Magnetic Resonance (BMRZ), Johann Wolfgang Goethe-University, Frankfurt a. M., Max-von-Laue-Straße
7, D-60438 Frankfurt, Germany
2. Protein Dynamics and Flexibility by NMR, Institut de Biologie Structurale
Jean-Pierre Ebel, CEA-CNRS-UJF UMR 5075, 41 Rue Jules Horowitz, Grenoble 38027, France