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. 2013 Sep 2;41(22):10379–10390. doi: 10.1093/nar/gkt781

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© The Author(s) 2013. Published by Oxford University Press.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — Examples of G-quadruplexes. (A) An intramolecular G-quadruplex of three G-quartet layers. (B) Intermolecular G-quadruplexes composed of two, three and four nucleic acid strands, respectively. (C) An intramolecular G-quadruplex in dsDNA. (D) An DNA:RNA hybrid quadruplex (HQ) in dsDNA.