About the Authors
Department of Microbiology and Immunology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: CAM LAL. Performed the experiments: CAM. Analyzed the data: CAM LAL. Contributed reagents/materials/analysis tools: CAM. Wrote the paper: CAM LAL.