1. Division of Molecular Microbiology; College of Life Sciences; University of Dundee; Dundee UK
2. School of Microbiology; Biosciences Institute; University College Cork; Cork Ireland
3. Division of Biological Chemistry and Drug Discovery; College of Life Sciences; University of Dundee; Dundee UK
4. Department of Medical Microbiology; University of Groningen, University Medical Center Groningen; Hanzeplein 1, P.O. Box 30001 9700 RB Groningen The Netherlands