About the Authors
Department of Microbiology and Immunology, Stanford University, Stanford, California, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: MCC KLL DSS. Performed the experiments: MCC KLL. Analyzed the data: MCC KLL DSS. Contributed reagents/materials/analysis tools: MCC KLL. Wrote the paper: MCC KLL DSS.