PurinesPurine NucleotidesPurine NucleosidesHypoxanthinesHypoxanthineAdeninePurine-Nucleoside PhosphorylasePhosphoribosyl PyrophosphateBase PairingPentosyltransferasesGuanineInosinePyrimidine NucleotidesRibosemonophosphatesBase SequenceNucleobase Transport ProteinsGuanosineNucleosidesPyrimidine NucleosidesHypoxanthine PhosphoribosyltransferaseDeoxyadenosinesDNANucleic Acid ConformationNucleotidesKineticsPyrimidinesMolecular Sequence DataSubstrate SpecificityOligonucleotidesMutationEscherichia coliModels, MolecularBase CompositionStructure-Activity RelationshipSkull BaseBiological Transport, ActiveSchiff BasesBinding SitesThermodynamicsInosine MonophosphateAmidophosphoribosyltransferasePurine-Pyrimidine Metabolism, Inborn ErrorsMethylthioinosineAdenosinePhosphoribosylglycinamide FormyltransferaseXanthineHydroxymethyl and Formyl TransferasesAdenine PhosphoribosyltransferaseAdenylosuccinate LyaseAdenosine DeaminaseBase Pair MismatchPhosphoribosylaminoimidazolecarboxamide FormyltransferaseRibose-Phosphate PyrophosphokinaseSkull Base NeoplasmsLesch-Nyhan SyndromeRibonucleotidesRibonucleosidesXanthinesInosine NucleotidesGuanosine MonophosphateAdenylosuccinate SynthaseAzaserineAllantoin2-AminopurineAzaguanineUric AcidPentosephosphatesFormycinsAdenine NucleotidesAmino Acid SequenceDeoxyribonucleosidesAdenosine MonophosphateDenture BasesOligodeoxyribonucleotidesCarbon-Nitrogen Ligases with Glutamine as Amide-N-DonorAdenosine TriphosphateDeoxyguanosineNucleoside Transport ProteinsN-Glycosyl HydrolasesHydrogen BondingCloning, MolecularXanthine DehydrogenaseThymineAdenosine KinaseAdenosine Deaminase InhibitorsNucleotidasesThionucleosidesUracilIMP DehydrogenaseFormatesCladribine5'-NucleotidaseCarbon-Nitrogen LigasesRNAMolecular StructurePentostatinReceptors, PurinergicDNA GlycosylasesTubercidinDeoxyguanine Nucleotides