About the Authors
Department of Chemistry and Biochemistry and the Molecular Biology Institute, University of California Los Angeles, Los Angeles, California, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: KBM JDL SGC. Performed the experiments: KBM JDL. Analyzed the data: KBM JDL SGC. Contributed reagents/materials/analysis tools: KBM JDL SGC. Wrote the paper: KBM JDL SGC.