About the Authors
Department of Immunology, University of Toronto, Toronto, Canada
Howard Hughes Medical Institute, Department of Molecular, Cellular, and Developmental Biology, University of Colorado at Boulder, Boulder, Colorado, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: JY-P DR AM. Performed the experiments: JY-P SR AZ RMN AB MB AK. Analyzed the data: JY-P SR AZ RMN AB MB DR AM AK. Wrote the paper: JY-P AM.