About the Authors
Boston Biomedical Research Institute, Watertown, Massachusetts, United States of America
Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: MLD JS. Performed the experiments: MLD AE JS. Analyzed the data: MLD AE JS. Contributed reagents/materials/analysis tools: MLD AE JS. Wrote the paper: JS.