About the Authors
Section of Cell and Developmental Biology, University of California San Diego, La Jolla, California, United States of America
Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, Canada
Department of Pediatrics, University of Michigan Medical Center, Ann Arbor, Michigan, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: IR GT JJD AK. Performed the experiments: IR LY JJD. Analyzed the data: IR LY GT JJD AK. Contributed reagents/materials/analysis tools: IR AK. Wrote the paper: IR AK.