About the Authors
Department of Biochemistry, Molecular Biology, and Cell Biology, Northwestern University, Evanston, Illinois, United States of America
The authors have declared that no competing interests exist.
DGB and JHB conceived and designed the experiments. DGB, IC, YFM, SA, PCL, and JHB performed the experiments. DGB, IC, SA, and JHB analyzed the data. JW contributed reagents/materials/analysis tools. JHB wrote the paper.