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. 2017 Oct 4;8:1719. doi: 10.3389/fpls.2017.01719

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Copyright © 2017 Liu and El-Kassaby.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Mapping statistics showing the distribution of sRNA frequencies (by classification; A,B) and size 21~24-nt categories; (C) in Picea glauca and Arabidopsis thaliana libraries. Small RNAs mainly include: transfer RNAs (tRNAs), ribosomal RNAs (rRNAs), microRNAs (miRNAs), small interfering RNAs (siRNAs), small nuclear ribonucleic RNAs (snRNAs), small nucleolar RNAs (snoRNAs), long noncoding RNAs (lncRNAs), Piwi interacting RNAs (piRNAs), and repeat associated RNAs (asiRNAs). Relative proportions of sRNA sequences here considered cover the length range from 15 to 30 nt. In genome mapping, miRBase is “sense” (see the legend of pie charts).