About the Authors
Department of Biology, McMaster University, Hamilton, Ontario, Canada
Ottawa Health Research Institute, Molecular Medicine Program, Ottawa, Ontario, Canada
The authors have declared that no conflicts of interest exist.
PS and MAR conceived and designed the experiments. PS performed the experiments, with the exception of Figure 4B performed by JI. PS and MAR analyzed the data. PS, JI, and AS contributed reagents/materials/analysis tools. PS and MAR wrote the paper.