1. Institute for Computing Applications “M. Picone”, National Research Council of Italy, via dei Taurini 19, 00185 Roma, Italy
2. Institute of Genetics and Biophysics “A. Buzzati Traverso”, National Research Council of Italy, via Pietro Castellino 111, 08013 Naples, Italy
3. Institute of Protein Biochemistry National Research Council of Italy, via Pietro Castellino 111, 08013 Naples, Italy