About the Authors

Christine Vogel

To whom correspondence should be addressed. E-mail: cvogel@mail.utexas.edu

Affiliations Medical Research Council Laboratory of Molecular Biology, Cambridge, United Kingdom , Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, Texas, United States of America

Cyrus Chothia

Affiliation Medical Research Council Laboratory of Molecular Biology, Cambridge, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

CV and CC conceived and designed the experiments. CV performed the experiments. CV and CC analyzed the data. CV and CC wrote the paper.