About the Authors
Tropical Disease Research Unit and Sandler Center for Drug Discovery, Department of Pathology, University of California, San Francisco, California, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: PSD JCE. Performed the experiments: PSD YMZ IH JCE. Analyzed the data: PSD JCE JHM DCG. Contributed reagents/materials/analysis tools: DCG. Wrote the paper: PSD.