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. 2021 Feb 27;11(3):366. doi: 10.3390/biom11030366

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Chromatograms resulting from co-injection of standards with the CT-DNA sample exposed to 5 mmol acetaldehyde. From the top, N⁴-ethyl-dC (m/z 256.1292), [D₅]N⁴-ethyl-dC (m/z 261.1605), N⁶-ethyl-dA (m/z 280.1404), [D₅]N⁶-ethyl-dA (m/z 285.1718), N²-ethyl-dG (m/z 296.1353), and [¹⁵N₅]N²-ethyl-dG (m/z 301.1205).