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Such an altered base pair, known as a tautomer, can quickly jump back to its original arrangement.—Lars Fischer, Scientific American, 18 Aug. 2022 Called a tautomer, the drug assumes two forms, one which closely resembles uracil (U) and the other cytosine (C).—William A. Haseltine, Forbes, 8 Oct. 2021
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Etymology
International Scientific Vocabulary, from tautomeric
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