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Proposed topologies of low- (A) and high-temperature (B) forms of dimeric G-quadruplexes formed by 32R-3n in the presence of K+ ions. Guanines in anti and syn conformation are depicted in green and blue, respectively. Adenines and cytosines are in purple and red, respectively. Some loop and overhang residues are omitted for clarity. An axis of symmetry traverses central cavities of both G-quadruplex units.
