1. Department of Biology, University of Texas—Arlington, Arlington, Texas, USA
2. Centre for Bacterial Cell Biology, Biosciences Institute, Newcastle University, Newcastle upon Tyne, United Kingdom
3. Biosciences Institute, Newcastle University, Newcastle upon Tyne, United Kingdom
4. Weill Institute for Cell and Molecular Biology, Cornell University, Ithaca, New York, USA
5. Department of Microbiology, Cornell University, Ithaca, New York, USA
6. Cornell Institute of Host-Microbe Interactions and Disease, Cornell University, Ithaca, New York, USA