1. Institute of Physics, Catholic University Medical School, 00168
Rome, Italy.
2. Institute of General Pathology, Catholic University Medical
School, 00168 Rome, Italy.
3. Novo Nordisk A/S, DK-2760 Måløv, Denmark.
4. Department of Molecular Biology, August Krogh Building,
Universitetsparken 13, DK-2100 Copenhagen, Denmark.