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The CD spectra of the G-quadruplex containing Tg (A) or oxoG (B). Concentration of G-quadruplexes was 10 μM. CD spectra were recorded at 25°C in the following buffer: 50 mM Tris–HCl pH 7.5, 140 mM KCl, 1 mM EDTA. Representative spectra of quadruplexes are given.
