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. 2019 Nov 29;10:5442. doi: 10.1038/s41467-019-13384-y

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© This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 6 — Proposed synthesis pathway for the 2′-deoxy-7-deazaguanine modifications identified in this study. The percentages of modifications identified for each phage are shown in boxes next to the modification of interest. Protein names in green are the reactions identified in this study. In red are the proposed reactions. Molecule abbreviations: guanosine tri-phosphate (GTP), 7-cyano-7-deazaguanine (preQ₀), 2′-deoxy-7-cyano-7-deazaguanosine (dPreQ₀), guanine (G), 2′-deoxyguanosine (dG), 2′-deoxy-7-aminomethyl-7-deazaguanosine (dPreQ₁), 2′-deoxy-7-amido-7-deazaguanosine (dADG), and 2′-deoxyarchaeaosine (dG⁺).