1. Bacterial Cell Biology; Swammerdam Institute for Life Sciences; University of Amsterdam; Science Park 904, 1098 XH Amsterdam, P.O. Box 94232; 1090 GE; Amsterdam; the Netherlands
2. Molecular Cytology; Swammerdam Institute for Life Sciences; University of Amsterdam; Science Park 904, 1098 XH Amsterdam, P.O. Box 94215; 1090 GE; Amsterdam; the Netherlands
3. Institute for Cell and Molecular Biosciences; The Centre for Bacterial Cell Biology; Newcastle University; Richardson Road; Newcastle upon Tyne; NE2 4AX; UK