1. Magnetic
Resonance Center CERM, University of Florence, Via Luigi Sacconi 6, 50019 Sesto Fiorentino, Florence, Italy
2. Department
of Biotechnology, Chemistry and Pharmacy, University of Siena, Via Aldo Moro 2, 53100 Siena, Italy
3. CHORI (Children’s
Hospital Oakland Research Institute), 5700 Martin Luther King, Jr. Way, Oakland, California 94609, United States
4. Department
of Molecular and Structural Biochemistry, North Carolina State University, Raleigh, North Carolina 29695-7622, United States
5. Department
of Chemistry, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Florence, Italy