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Methylation of adenine nucleobases, and the structure of kink turns in RNA.
(a). The chemical structure of the syn and anti conformers of N6-methyladenine. (b). The structure of a trans sugar-Hoogsteen (sheared) G:A base pair. (c). The sequence of H. marismortui Kt-7 k-turn, showing the nomenclature of the nucleotide positions and helices.
