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. 2019 Jun 21;2:235. doi: 10.1038/s42003-019-0479-2

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Scatterplots showing the results of the principal component analysis (PCA) analysis of intact OlfC genes with their respective OlfC gene subfamilies. Both OlfC gene counts (a) and proportion (b) across each subfamily are shown. First and second axes explain more than 82% and 59.9% of the variance within the data set. Blue polygons represent fishes having fright reaction and green polygons represent fishes lacking fright reaction. Red arrows represent the contribution of particular subfamilies on the positioning of each species on the plots