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Additional Information

Competing Interests

The author declares that he has no competing interests.

Author Contributions

Robert Robinson conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Human Ethics

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

The Springfield Committee for research on human subjects reviewed the research proposal and determined that this project does not meet criteria for research involving human subjects according to 45 CFR 46.101 and 45 CFR 46.102

Data Deposition

The following information was supplied regarding data availability:

The raw data has been supplied as a supplementary file.


The author received no funding for this work.

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