Department of Biology, Centre for Molecular Bioinformatics, University of Rome Tor Vergata 00133 Rome, Italy. seq2struct@cbm.bio.uniroma2.it|Department of Biology, Centre for Molecular Bioinformatics, University of Rome Tor Vergata 00133 Rome, Italy. seq2struct@cbm.bio.uniroma2.it|Department of Biology, Centre for Molecular Bioinformatics, University of Rome Tor Vergata 00133 Rome, Italy. seq2struct@cbm.bio.uniroma2.it