About the Authors

Ning Zhang

Affiliation Department of Botany, National Museum of Natural History, MRC 166, Smithsonian Institution, Washington, DC, 20013–7012, United States of America

Jun Wen

wenj@si.edu (JW); zimmerl@si.edu (EAZ)

Affiliation Department of Botany, National Museum of Natural History, MRC 166, Smithsonian Institution, Washington, DC, 20013–7012, United States of America

Elizabeth A. Zimmer

wenj@si.edu (JW); zimmerl@si.edu (EAZ)

Affiliation Department of Botany, National Museum of Natural History, MRC 166, Smithsonian Institution, Washington, DC, 20013–7012, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: NZ EAZ LW. Performed the experiments: NZ. Analyzed the data: NZ. Contributed reagents/materials/analysis tools: NZ JW. Wrote the paper: NZ EAZ JW.