About the Authors

Krzysztof Owocki

Contributed equally to this work with: Krzysztof Owocki, Barbara Kremer, Józef Kaźmierczak

kowoc@twarda.pan.pl

Affiliation Institute of Paleobiology, Polish Academy of Sciences, Warsaw, Poland

Barbara Kremer

Contributed equally to this work with: Krzysztof Owocki, Barbara Kremer, Józef Kaźmierczak

Affiliation Institute of Paleobiology, Polish Academy of Sciences, Warsaw, Poland

Beata Wrzosek

‡ These authors also contributed equally to this work.

Affiliation Faculty of Chemistry, Warsaw University, Warsaw, Poland

Agata Królikowska

‡ These authors also contributed equally to this work.

Affiliation Faculty of Chemistry, Warsaw University, Warsaw, Poland

Józef Kaźmierczak

Contributed equally to this work with: Krzysztof Owocki, Barbara Kremer, Józef Kaźmierczak

Affiliation Institute of Paleobiology, Polish Academy of Sciences, Warsaw, Poland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: KO BK JK. Performed the experiments: BW AK BK KO. Analyzed the data: KO JK BK BW AK. Wrote the paper: KO BK AK JK.