1. TB Research group, Health Protection Agency, Centre for Emergency Preparedness and Response, Porton Down, Salisbury, Wiltshire SP4 0JG, UK
2. School of Biosciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
3. School of Crystallography, Birkbeck College, University of London, Malet Street, London WC1E 7HX, UK
4. Department of Pathology and Infectious Diseases, Royal Veterinary College, Royal College Street, London NW1 0TU, UK
5. Bacterial Microarray Group, Department of Cellular and Molecular Medicine, St George's Hospital Medical School, Cranmer Terrace, London SW17 0RE, UK