About the Authors
Department of Molecular and Cellular Biochemistry, Markey Cancer Center, University of Kentucky, Lexington, Kentucky, United States of America
The authors have declared that no competing interests exist.
The author(s) have made the following declarations about their contributions: Conceived and designed the experiments: RX JJ. Performed the experiments: RX HJ JF YL. Analyzed the data: RX JJ. Wrote the paper: JJ.