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. 2017 Nov 1;18:210. doi: 10.1186/s13059-017-1341-9

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Evolutionary history of LTR-Rs and duplications of protein-coding genes in the pepper genomes. a Distribution of LTR-R insertions. The graphs in the left and right panels depict the predicted insertion dates of LTR-R superfamilies (gypsy, copia) and two specific families (del, athila). The x- and y-axes indicate the insertion times and the number of insertions at each time, respectively. b Time-scaled gene duplication history (left) and top ten repertoires of massive gene duplication (right). The x- and y-axes of the graph in the left panel indicate the approximate duplication time (MYA) and the number of gene duplications, respectively. The x- and y-axes of the histogram in the right panel represent the number of genes and domain description, respectively