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. 2016 Jul 5;5(7):e332. doi: 10.1038/mtna.2016.37

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Copyright © 2016 Official journal of the American Society of Gene & Cell Therapy

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Illustration to show the structure of paired nucleic acid residues. The left panel is the A-U pair bonded to each other with two hydrogen bonds; the right panel is the G-C pair with three hydrogen bonds.