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Supplemental Information

Portraits of persons mentioned in this study

(A) Mariano Graells, together with alumnos, unknown date (MNCN-CSIC); (B) Patricio Paz y Membiela, unknown date (CCHS-CSIC).

DOI: 10.7287/peerj.preprints.2667v1/supp-1

Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Abraham SH Breure 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.

Rafael Araujo analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.

Data Deposition

The following information was supplied regarding data availability:



This work was supported by a grant from the SYNTHESYS Project ( which was financed by European Community Research Infrastructure Action under the FP7 Integrating Activities Programme; the grant was awarded to ASHB under number ES-TAF-5322. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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