Institution: | 1 Department of Molecular Microbiology, John Innes Centre, Norwich Research Park, Norwich NR4 7UH, UK2 Department of Biological Chemistry, John Innes Centre, Norwich Research Park, Norwich NR4 7UH, UK3 Mikrobiologisches Institut, Eberhard-Karls-Universität Tübingen, Auf der Morgenstelle 28, D-72076 Tübingen, Germany |