1. Centre de Bioinformatique, Biostatistique et Biologie Intégrative (C3BI, USR 3756 Institut Pasteur et CNRS), 25 rue du Docteur Roux, Paris, France
2. Computational Biology Unit, Department of Informatics, University of Bergen, Thormøhlensgate 55, Bergen, Norway
3. Earlham Institute, Norwich Research Park, NR4 7UG Norwich, United Kingdom
4. Institut de Biologie Paris-Seine, Université Pierre et Marie Curie, Paris, France
5. Department of Computer Science, Albert-Ludwigs-University,Center for Biological Systems Analysis (ZBSA), University of Freiburg, Freiburg, Germany
6. Department of Systems Biology, Center for Biological Sequence Analysis, Technical University of Denmark, Building 208, 2800 Kongens, Lyngby, Denmark.