Pyrimidine NucleosidesPyrimidine NucleotidesPyrimidinesFluorouracilPyrimidine DimersDeoxyribonuclease (Pyrimidine Dimer)Pyrimidine PhosphorylasesOrotic AcidUracilUltraviolet RaysOrotate PhosphoribosyltransferasePurinesDeoxyribodipyrimidine Photo-LyaseDihydroorotaseUridineNucleosidesPurine NucleotidesAspartate CarbamoyltransferaseStructure-Activity RelationshipCytidineCarbamoyl-Phosphate Synthase (Glutamine-Hydrolyzing)Orotidine-5'-Phosphate DecarboxylaseUridine PhosphorylaseKineticsPurine NucleosidesDihydroorotate OxidaseUracil NucleotidesMolecular StructureUridine KinasePentosyltransferasesThymineDNAUridine MonophosphateUridine TriphosphateDeoxyribonucleosidesMolecular Sequence DataDeoxyuridineDNA RepairBase SequenceNucleotidesEscherichia coliSubstrate SpecificityRibonucleosidesPurine-Pyrimidine Metabolism, Inborn ErrorsAdenineModels, MolecularNucleic Acid ConformationThiamineAcquired Hyperostosis SyndromeStereoisomerismCytosineThymidineDNA DamageMutationMagnetic Resonance SpectroscopyAmino Acid SequenceOligonucleotidesOxidoreductases Acting on CH-CH Group DonorsCytidine TriphosphateAzauridineN-Glycosyl HydrolasesCytosine NucleotidesRibonucleotides5'-NucleotidaseDisease ReservoirsNucleotidasesCell LineGuanosineDihydrouracil Dehydrogenase (NADP)Phosphoribosyl Pyrophosphate