About the Authors

Alexander Stark

Contributed equally to this work with: Alexander Stark, Julius Brennecke

Affiliation European Molecular Biology Laboratory, Heidelberg, Germany

Julius Brennecke

Contributed equally to this work with: Alexander Stark, Julius Brennecke

Affiliation European Molecular Biology Laboratory, Heidelberg, Germany

Robert B Russell

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

AS, JB, RBR, and SMC conceived and designed the experiments. AS and JB performed the experiments. AS, JB, RBR, and SMC analyzed the data. AS, JB, RBR, and SMC wrote the paper.