About the Authors

Per Christiansen

pc@bio.aau.dk

Affiliation Department of Biotechnology, Chemistry, and Environmental Engineering, University of Aalborg, Aalborg, Denmark

John M. Harris

Affiliation George C. Page Museum, Los Angeles, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: PC JH. Performed the experiments: PC. Analyzed the data: PC. Contributed reagents/materials/analysis tools: PC JH. Wrote the paper: PC JH.