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DNAs and RNAs that fold via the formation of guanine quartets form G‐quadruplexes that are often highly diverse in terms of architecture and topology. G‐quadruplexes are specifically stabilized by metal cations such as K+ and Sr2+, but not Li+. DNA duplexes that incorporate two separated clusters of G•G mismatches (“P‐duplexes”) can function as electronic switches, capable of toggling reversibly from...
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