About the Authors

Daniel H. Chitwood

dchitwood@danforthcenter.org

Affiliation Donald Danforth Plant Science Center, St. Louis, Missouri, United States of America

Competing Interests

The author has declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: DHC. Performed the experiments: DHC. Analyzed the data: DHC. Wrote the paper: DHC.