Thymine NucleotidesMegaloblastsThymineAnemia, MegaloblasticLeukemia, LymphoidMethotrexateNucleotidesBase SequenceThymine DNA GlycosylaseBase PairingMolecular Sequence DataDNAUracilPolymorphism, Single NucleotideNucleic Acid ConformationAdenine NucleotidesPyrimidine DimersAmino Acid SequenceBase CompositionDeoxyribonuclease (Pyrimidine Dimer)Escherichia coliGuanine NucleotidesBromouracilPentoxylCloning, MolecularPurine NucleotidesOsmium TetroxideCytosineMutationDNA RepairOligodeoxyribonucleotidesAdenineDNA, BacterialBase Pair MismatchKineticsPyrimidine NucleotidesEndodeoxyribonucleasesSequence Analysis, DNAOligonucleotidesUltraviolet RaysThymidineBinding SitesSequence Homology, Nucleic AcidGuanineSkull BaseNucleotides, CyclicGuanine Nucleotide Exchange FactorsPotassium PermanganateTranscription, GeneticSchiff BasesPlasmidsGenesModels, MolecularSubstrate Specificity