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Absorbance and CD spectra. UV absorbance (A) and circular dichroic (B) spectra of the human telomere quadruplex sequence 5′AGGG(TTAGGG)3 in phosphate buffer (pH 7.0) containing 200 mM NaCl. Spectra obtained at 20°C are indicated by the solid line and correspond to the fully folded quadruplex form. Spectra obtained at 95°C are indicated by the dotted line, and correspond to the denatured, unfolded form.
