About the Authors

David R Hipfner

Affiliation European Molecular Biology Laboratory, Heidelberg, Germany

Stephen M Cohen

To whom correspondence should be addressed. E-mail: cohen@embl.de

Affiliation European Molecular Biology Laboratory, Heidelberg, Germany

Competing Interests

The authors have declared that no conflicts of interest exist.

Author Contributions

DRH and SMC conceived and designed the experiments. DRH performed the experiments. DRH and SMC analyzed the data. DRH and SMC wrote the paper. SMC discussed the experiments, design, and interpretation with DRH.