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. 2019 May 13;17:61. doi: 10.1186/s12951-019-0497-8

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© The Author(s) 2019

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. 4 — Putative TR hairpins found in the metagenomic ssRNA phage sequences for some of the CPs used in this study. The known TR hairpins of MS2, Qβ and PP7 phages are shown for reference. The initiation codon of the replicase gene is shown in red