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. 2019 Mar 29;20(Suppl 3):128. doi: 10.1186/s12859-019-2648-1

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© The Author(s) 2019

Open Access This 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. 1 — Secondary structure RNA motifs. a Pseudoknot-free secondary structure. b Pseudoknotted secondary structure. c RNA-RNA Interaction. d Crossing interaction (or external pseudoknot)