PyrimidinesSpectrophotometry, InfraredPyrazolesMagnetic Resonance SpectroscopyMolecular StructurePyrimidine NucleotidesStructure-Activity RelationshipPyrimidine DimersPyrimidine NucleosidesDeoxyribonuclease (Pyrimidine Dimer)Pyrimidine PhosphorylasesOrotic AcidUltraviolet RaysUracilOrotate PhosphoribosyltransferasePurinesDihydroorotaseDeoxyribodipyrimidine Photo-LyaseUridinePurine NucleotidesAspartate CarbamoyltransferaseCarbamoyl-Phosphate Synthase (Glutamine-Hydrolyzing)Orotidine-5'-Phosphate DecarboxylaseCytidineUridine PhosphorylaseDihydroorotate OxidaseNucleosidesUracil NucleotidesThymineUridine KinasePentosyltransferasesDNAKineticsPurine NucleosidesMolecular Sequence DataBase SequenceUridine MonophosphateDNA RepairEscherichia coliDeoxyribonucleosidesUridine TriphosphateDeoxyuridinePurine-Pyrimidine Metabolism, Inborn ErrorsStereoisomerismRibonucleosidesNucleotidesMutation