About the Authors
Wellcome Trust Centre for Gene Regulation and Expression, College of Life Sciences, University of Dundee, Dundee, Scotland, United Kingdom
Developmental Genetics, Technische Universität Braunschweig, Braunschweig, Germany
The authors have declared that no competing interests exist.
Conceived and designed the experiments: SCM AG. Performed the experiments: SCM SvE IB AA. Analyzed the data: SCM SvE IB AA RS AG. Contributed reagents/materials/analysis tools: SCM SvE. Wrote the paper: SCM AG.