PurinesPyrimidine NucleotidesAdeninePyrimidinesPyrimidine NucleosidesGuaninePurine NucleotidesPurine NucleosidesBase PairingUracilHypoxanthinesBase SequencePentosyltransferasesThymineNucleosidesHypoxanthinePyrimidine DimersDNACytosinePurine-Nucleoside PhosphorylaseCytidineNucleic Acid ConformationDeoxyribonuclease (Pyrimidine Dimer)Phosphoribosyl PyrophosphateInosineUridineGuanine NucleotidesOligonucleotidesDeoxyuridineGuanosineKineticsCytosine DeaminaseMolecular Sequence DataAdenine NucleotidesNucleobase Transport ProteinsRibosemonophosphatesSubstrate SpecificityOligodeoxyribonucleotidesModels, MolecularNucleotidesUltraviolet RaysGuanine Nucleotide Exchange FactorsHypoxanthine PhosphoribosyltransferaseDeoxyadenosinesBinding SitesBase CompositionEscherichia coliMutationThymidineDNA Damage5-MethylcytosineDeaminationDNA-Cytosine MethylasesSkull BaseStructure-Activity RelationshipGuanine DeaminaseOrotic AcidSchiff BasesPyrimidine PhosphorylasesN-Glycosyl HydrolasesDNA RepairCytosine NucleotidesGuanosine TriphosphateAmino Acid SequenceDNA GlycosylasesCytarabineBase Pair MismatchNucleoside DeaminasesOrotate PhosphoribosyltransferaseDeoxyribonucleosidesThermodynamicsPurine-Pyrimidine Metabolism, Inborn ErrorsDeoxyribodipyrimidine Photo-LyaseAdenosineFlucytosineDihydroorotaseHydrogen Bonding2-AminopurineDNA MethylationRibonucleosidesAdenosine TriphosphateInosine MonophosphateMolecular StructureSulfitesDeoxyguanosineMethylationUridine PhosphorylaseRibonucleotidesUracil NucleotidesAspartate CarbamoyltransferaseCloning, MolecularAdenosine MonophosphateCell LineRho Guanine Nucleotide Exchange FactorsOrotidine-5'-Phosphate DecarboxylaseGuanosine DiphosphateUridine TriphosphateCarbamoyl-Phosphate Synthase (Glutamine-Hydrolyzing)Uridine KinaseGuanosine Monophosphate