About the Authors

Alexander Ulrich

Affiliations Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America, Institut für Chemie und Biochemie, Freie Universität Berlin, Berlin, Germany

Kasper R. Andersen

Affiliation Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America

Thomas U. Schwartz

tus@mit.edu

Affiliation Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America

Competing Interests

The authors have declared that no competing interest exists.

Author Contributions

Conceived and designed the experiments: AU KRA TUS. Performed the experiments: AU. Analyzed the data: AU TUS. Wrote the paper: AU TUS.