About the Authors
Institute of Molecular and Cell Biology, Singapore
The Institute for Genomic Research, Rockville, Maryland, United States of America
J. Craig Venter Institute, Rockville, Maryland, United States of America
The authors have declared that no competing interests exist.
BV and SB conceived the project. BV, EFK, and RLS designed the experiments. YHL, ALH, APL, JJ, ND, LDV, and AT performed the experiments. BV, EFK, YHL, ALH, APL, JJ, JCV, RLS, and SB analyzed the data. BV and EFK wrote the paper, which JCV, RLS, and SB assisted in refining.