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Schematic representations of the folded structures of AG3(T2AG3)3 I derived from those used by Patel (6): (A) from NMR, in Na+ solution, proposed by Wang and Patel (2); (B) in the crystalline state with K+ ions, proposed by Parkinson et al. (3). The sequences of AG3(T2AG3)3 I and (T2AG3)4 II are given with the nucleotide numbering chosen in this paper for the purpose of comparison.
