About the Authors
Institute of Evolutionary Biology, University of Edinburgh, Edinburgh, United Kingdom
Program for Molecular Structure and Function, Hospital for Sick Children, Toronto, Ontario, Canada
Department of Biochemistry, University of Leicester, Leicester, United Kingdom
The authors have declared that no competing interests exist.
Conceived and designed the experiments: JW RS AH MB. Performed the experiments: JW RS AH MB. Analyzed the data: JW RS AH MB. Contributed reagents/materials/analysis tools: JW RS AH MB. Wrote the paper: JW RS AH MB.