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. 2022 Sep 12;50(17):9621–9631. doi: 10.1093/nar/gkac740

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© The Author(s) 2022. Published by Oxford University Press on behalf of Nucleic Acids Research.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — (A) Illustration of the slip-out structure of (CXG)n/(CYG)n repeat in the double-stranded DNA. Chemical structures of (B) NA and (D) NCD. The proton numbering scheme of naphthyridine moiety in NCD is also shown along with the chemical structure. (C) Illustration of the NA-AA1 complex comprised of two NA molecules and a dsDNA containing a CAG/CAG triad DNA (AA1) and the NCD-GG1 complex (this study) comprised of two NCD molecules and a dsDNA containing a CGG/CGG triad DNA (GG1). Rectangle shapes with red and blue color are azaquinolone (AQ) and naphthyridine (NP) heterocycle, respectively.