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Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Heinrich Mallison conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables.

Michael Pittman conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.

Daniela Schwarz performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.

Animal Ethics

The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):

Specimens were acquired as cadavers, thus no permissions were required.

Funding

HM received funding from DFG grant SCHW 1452/3-1. MP received funding from University Research Committee of the University of Hong Kong through the Seed Funding Programme for Basic Research (201304159004) and Conference Support for Teaching Staff (201407170124), as well as the University’s Faculty of Science. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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