About the Authors
Department of Molecular Microbiology and Immunology and Graduate Program in Pathobiology, Division of Biology and Medicine, Brown University, Providence, Rhode Island, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: MST ECR LB. Performed the experiments: MST ECR. Analyzed the data: MST ECR LB. Wrote the paper: MST ECR LB.