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. 2018 Sep 19;9:2097. doi: 10.3389/fimmu.2018.02097

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Copyright © 2018 Smyth, Negroni, Lever, Mak and Kenyon.

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) and the copyright owner(s) 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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Examples of RNA structures. (A) Structural diagram of the hepatitis C virus IRES structure, showing its pseudoknot. Adapted from Malygin et al.(4), (B) Structural model of the HIV-1 5'leader RNA, highlighting some of the important RNA structures it contains. Adapted from Kenyon et al. (5), (C) An RNA guanine quadruplex structure, showing the 4-way bonds between guanines in each plane. Adapted from Frees et al. (6).