1. Department of Science and High Technology and Center of Bioinformatics, University of Insubria, Busto Arsizio 21052, Italy
2. Computer and Laboratory Investigation of Proteins of Human Origin (CALIPHO), SIB Swiss Institute of Bioinformatics, and Department of Microbiology and Molecular Medicine, Faculty of Medicine, University of Geneva, Centre Médical Universitaire (CMU), 1211 Geneva 4, Switzerland