About the Authors
Howard Hughes Medical Institute, Department of Biochemistry and Molecular Biophysics, Columbia University, New York, New York, United States of America
Center for Computational Biology and Bioinformatics, Columbia University, New York, New York, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: AK BH DP. Performed the experiments: AK. Analyzed the data: AK BH DP. Contributed reagents/materials/analysis tools: AK DP. Wrote the paper: AK BH DP.