Paul Janssen1,3, Benjamin Audit2, Ildefonso Cases2, Nikos Darzentas2, Leon Goldovsky2, Victor Kunin2, Nuria Lopez-Bigas2, José Manuel Peregrin-Alvarez2, José B Pereira-Leal2, Sophia Tsoka2 and Christos A Ouzounis2 
1Centre d'Ingénierie des Protéines (CIP), Université de Liège, 4000 Liège, Belgium
2Computational Genomics Group, The European Bioinformatics Institute, EMBL Cambridge Outstation, Cambridge CB10 1SD, UK
3Laboratory of Microbiology, Belgian Nuclear Research Centre, SCK/CEN, Boeretang 200, B-2400-MOL, Belgium