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What a pentaplexing situation: Isoguanine (iG) is an isomer of guanine, where the positions of the C2 amino group and the C6 carboxy group are swapped. iG can self‐assemble into pentads in the presence of alkali metal cations. Cs+ ions were found to stabilize a pentaplex of d(T(iG)4T). Solution NMR studies of this pentaplex in the presence of Cs+ ions (or Na+, K+, Rb+, or NH4+ cations) demonstrate...
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