1. Department of Biological Sciences, Clemson University, Clemson, South Carolina, USA
2. Morgridge Institute for Research, Madison, Wisconsin, USA
3. Department of Integrative Biology, University of Wisconsin-Madison, Madison, Wisconsin, USA
4. Max Planck Institute for Molecular Cell Biology and Genetics, Dresden, Germany
5. Department of Medical Microbiology and Immunology, University of Wisconsin-Madison, Madison, Wisconsin, USA
6. Department of Bacteriology, University of Wisconsin-Madison, Madison, Wisconsin, USA
7. Department of Pediatrics, University of Wisconsin-Madison, Madison, Wisconsin, USA