G-QuadruplexesXanthopterinGuanineNucleic Acid DenaturationCircular DichroismNucleic Acid ConformationDNATelomereOligonucleotidesAptamers, NucleotideNuclear Magnetic Resonance, BiomolecularThermodynamicsCalorimetry, Differential ScanningTemperatureModels, MolecularBase PairingOligodeoxyribonucleotidesBase SequenceSpectrophotometry, UltravioletPotassiumSpectrometry, Mass, Electrospray IonizationRNAMagnetic Resonance SpectroscopyKineticsMolecular Sequence Data