Heterocyclic CompoundsPurine NucleotidesHeterocyclic Compounds, Bridged-RingPurinesNitrogen CompoundsCyclizationHeterocyclic Compounds, 2-RingPalladiumNucleotidesPurine NucleosidesHeterocyclic Compounds with 4 or More RingsMolecular StructureHeterocyclic Compounds, 3-RingInosine MonophosphateAmidophosphoribosyltransferaseHeterocyclic Compounds, 1-RingMagnetic Resonance SpectroscopyAdenine NucleotidesPhosphoribosyl PyrophosphateRibose-Phosphate PyrophosphokinasePyrimidine NucleotidesAMP DeaminaseNucleotide DeaminasesGuanine NucleotidesHypoxanthinesAdenylosuccinate LyaseInosine NucleotidesPurine-Nucleoside PhosphorylaseHypoxanthineMolecular Sequence DataAdenylosuccinate SynthaseInosineHypoxanthine PhosphoribosyltransferaseRibonucleotidesAdenosine TriphosphateAdenineMethylthioinosinePhosphoribosylaminoimidazolecarboxamide FormyltransferasePentosyltransferasesPentosephosphatesGMP ReductaseAdenosine MonophosphateRibonucleosidesBase SequenceGuanosine TriphosphateGuanosine MonophosphateAzaserineKineticsPurine-Pyrimidine Metabolism, Inborn ErrorsAmino Acid SequenceAcanthamoeba castellanii5,10-Methylenetetrahydrofolate Reductase (FADH2)GuanineHydroxymethyl and Formyl TransferasesAminoimidazole CarboxamideEscherichia coliGuanine DeaminasePolymorphism, Single NucleotideLesch-Nyhan SyndromeIMP DehydrogenaseSulfanilic AcidsCloning, MolecularAdenosineCarbon-Nitrogen LigasesAdenine PhosphoribosyltransferaseXanthineUridine TriphosphateAdenosine DiphosphateMutationGuanosine DiphosphateAmmoniaPhosphoribosylglycinamide FormyltransferaseDNAAdenosine DeaminaseBinding SitesMitochondrial ProteinsSuramin5'-NucleotidaseStructure-Activity RelationshipNucleotidasesSubstrate SpecificitySequence Homology, Nucleic AcidGlutamineXanthinesNucleic Acid ConformationNADModels, MolecularReceptors, Purinergic P2Adipose Tissue, BrownTranscription, GeneticCell LineCarcinoma, Ehrlich TumorNucleotides, CyclicPhosphotransferasesChromatography, High Pressure LiquidReceptors, PurinergicProtein BindingCarbamyl PhosphateSequence Analysis, DNARestriction Mapping