About the Authors
Microbial Genetics Department, University of Tübingen, Tübingen, Germany
Medical Microbiology and Hygiene Department, University of Tübingen, Tübingen, Germany
Department of Microbiology, Dartmouth Medical School, Hanover, New Hampshire, United States of America
The authors have declared that no competing interests exist.
SH and FG conceived and designed the experiments and wrote the paper. SH and DK performed the experiments. SH, CN, and FG analyzed the data. SH, AB, AP, CG, MM, AC, and FG contributed reagents/materials/analysis tools.