About the Authors

Hengyi Xu

Affiliation Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas, United States of America

Andrew D. L. Nelson

Current address: School of Plant Sciences, University of Arizona, Tucson, Arizona, United States of America

Affiliation Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas, United States of America

Dorothy E. Shippen

dshippen@tamu.edu

Affiliation Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: HX ADLN DES. Performed the experiments: HX ADLN. Analyzed the data: HX ADLN DES. Contributed reagents/materials/analysis tools: HX ADLN. Wrote the paper: HX ADLN DES.