Nucleobase Transport ProteinsNucleosidesNucleoside Transport ProteinsPeptide Nucleic AcidsPurinesBase PairingUracilEvolution, ChemicalHypoxanthineAdenineGuanineCytosineThymineNucleic AcidsDeoxyriboseThioinosineEquilibrative Nucleoside Transporter 1ThiouracilPurine NucleosidesPyrimidine NucleosidesEquilibrative-Nucleoside Transporter 2XanthineDNAOligonucleotidesNucleic Acid ConformationMeteoroidsRNA, CatalyticGuanosineInosineUridineExtraterrestrial EnvironmentCytidinePurine NucleotidesMolecular StructureDeoxyribonucleosidesHypoxanthinesPyrimidinesNucleotidesRNAHydrogen BondingSpectrometry, Mass, Electrospray IonizationOligodeoxyribonucleotidesDeoxyadenosinesModels, MolecularModels, ChemicalElectronsKineticsBase SequenceStatic ElectricityAdenosineOrganophosphorus CompoundsSubstrate SpecificityThermodynamicsNucleic Acid DenaturationHydrophobic and Hydrophilic InteractionsBiological TransportDNA-Directed DNA PolymeraseChromatography, High Pressure LiquidHydrogen-Ion ConcentrationThymidineMolecular Sequence DataTemperatureCatalysisDNA DamageMass SpectrometryStructure-Activity RelationshipCrystallography, X-RayBinding Sites