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Effect of PEG 200 on the thermal stability of human telomere G-quadruplex and hairpin duplex structure. Fluorescence melting assays were carried out in (A) 150 mM K+ or (B) 5 mM K+/145 mM Li+ solution containing 0, 5, 10, 15, 20, 25, 30, 35, 40% (w/v) of PEG 200, respectively. The horizontal arrow indicates the direction of increasing in PEG concentration.
