1. Academic Unit of Respiratory Medicine, Department of Infection and Immunity, University of Sheffield, Sheffield S10 2JF, U.K.
2. European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridgeshire CB10 1SA, U.K.
3. Krebs Institute for Biomolecular Research, Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield S10 2TN, U.K.