1. Department of Biochemistry and Molecular Biophysics, Washington University in St. Louis, St. Louis, Missouri 63130, United States
2. Department of Medical Biotechnology and Translational Medicine, Università degli Studi di Milano, 20122 Milano, Italy
3. Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, United States
4. Istituto di Chimica del Riconoscimento Molecolare, Consiglio Nazionale delle Ricerche, 20131 Milano, Italy