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Single‐stranded DNAs and RNAs that are rich in the nucleobase guanine form four‐stranded G‐quadruplexes, which are held together by hydrogen‐bonded guanine quartets. In aqueous solution, both DNA duplexes and G‐quadruplexes are modest conductors of electrical charge. A tight, topologically constrained DNA construct called twDNA is now reported, in which a core of four guanine‐rich single strands structurally...
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