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. 2017 Aug 23;18:158. doi: 10.1186/s13059-017-1291-2

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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. 7 — Heatmap for conserved miRNA candidates. Each row represents a miRNA family. Colors indicate the scaled expression levels of these miRNA families (log2(RPM)). Rows are divided into five groups: class I miRNA candidates were found at high levels in all species; class II miRNA candidates were found in most ferns but few or no lycophytes; class III miRNA candidates were detected at high levels in multiple species in both lycophytes and ferns; class IV miRNA candidates were detected mainly in lycophytes; and class V miRNA candidates were at high levels in specific species