About the Authors

Ji H. Mazák

jimazak@gmail.com

Affiliation Shanghai Science and Technology Museum, Shanghai, People's Republic of China

Per Christiansen

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

Andrew C. Kitchener

Affiliation National Museums Scotland, Edinburgh, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Performed the experiments: JHM PC. Contributed reagents/materials/analysis tools: JHM PC. Wrote the paper: JHM PC ACK. Designed research: JHM PC ACK. Performed the analyses: JHM PC.