1. Telethon Institute of Genetics and Medicine, Naples 80131, Italy.
2. Institute of Protein Biochemistry, Naples 80131, Italy.
3. Besta Institute, Milan 20126, Italy.
4. Stazione Zoologica Anton Dohrn, Naples 80121, Italy.
5. Departments of Medicine and Biochemistry and Molecular Biology, University of Florida College of Medicine, Gainesville, FL 32610, USA.
6. Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA.
7. Howard Hughes Institute, Baylor College of Medicine, Houston, TX 77030, USA.
8. Department of Pediatrics, Federico II University of Naples, Naples 80131, Italy.