About the Authors

Tao Xu
William Brown
Martin G. Marinus

martin.marinus@umassmed.edu

Affiliation Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts, United States of America

Competing Interests

Co-author MG Marinus is a PLoS ONE Editorial Board member. This does not alter the authors' adherence to all PLoS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: MGM. Performed the experiments: TX WB. Analyzed the data: TX WB MGM. Wrote the paper: TX WB MGM.