1. Department
of Biotechnology, University of Verona, Strada Le Grazie 15, 37134 Verona, Italy
2. Centre
de RMN à Trés Hauts Champs, Institut de Sciences Analytiques, Université de Lyon, CNRS/ENS Lyon/UCB Lyon 1, 69100 Villeurbanne, France
3. Laboratorio
NMR, Istituto per lo Studio delle Macromolecole, CNR, Via Bassini 15, 20133 Milano, Italy