1. Division of Mycobacterial Research, National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK.
2. Bacterial Microarray Group, Department of Medical Microbiology, St George's Hospital Medical School, Cranmer Terrace, London SW17 0RE, UK.
3. Institut für Medizinische Mikrobiologie, Universität Zürich, Gloriastr. 30/32, CH‐8028 Zürich, Switzerland.