About the Authors
Department of Biology, Texas A&M University, College Station, Texas, United States of America
Howard Hughes Medical Institute, Texas A&M University, College Station, Texas, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: YL LRG. Performed the experiments: YL BL XG PAC DGG LRG. Analyzed the data: YL BL XG LRG. Contributed reagents/materials/analysis tools: YL RL LRG. Wrote the paper: YL LRG.