Alain Filloux1, Chris Whitfield2. 1. Department of Life Sciences, MRC Centre for Molecular Bacteriology and Infection, Imperial College London, South Kensington Campus, London, SW7 2AZ, United Kingdom a.filloux@imperial.ac.uk cwhitfie@uoguelph.ca. 2. Department of Molecular and Cellular Biology, University of Guelph, Guelph, ON, Canada N1G 2W1 a.filloux@imperial.ac.uk cwhitfie@uoguelph.ca.