About the Authors
Department of Astronomy and Theoretical Physics, Computational Biology and Biological Physics group, Lund University, Lund, Sweden
College of Chemistry and Molecular Engineering, and Center for Quantitative Biology, Peking University, Beijing, China
The authors have declared that no competing interests exist.
Conceived and designed the experiments: IS YH ZL SW. Performed the experiments: IS YH. Analyzed the data: IS YH. Wrote the paper: IS YH ZL SW.