About the Authors
Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, Massachusetts, United States of America
Howard Hughes Medical Institute, Tufts University School of Medicine, Boston, Massachusetts, United States of America
The authors have declared that no competing interests exist.
KWW and RRI conceived and designed the experiments. KWW performed the experiments. KWW and RRI analyzed the data. RRI contributed reagents/materials/analysis tools. KWW and RRI wrote the paper.