Cover: Model of DNA secondary structure composed of compact-stacking multimers of hybrid-type G-quadruplexes in human telomeres. The telomeric G-quadruplexes in K+ solution are in equilibrium between Hybrid-1 and Hybrid-2 forms with a low energy barrier between them. See the article by Dai et al. (Nucleic Acids Res. (2007) 35, 4927–4940).
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