Tetrahydrofolate DehydrogenaseFolic Acid AntagonistsTrimethoprimMethotrexateTrimetrexateTrimethoprim ResistanceDrug ResistanceThymidylate SynthaseLactobacillus caseiDihydropteroate SynthasePyrimethamineTetrahydrofolatesAminopterinPolyglutamic AcidFolic AcidNADPProguanilGene AmplificationLeukemia L1210Escherichia coliCricetinaeSulfadoxineCricetulusAntimalarialsGenesKineticsTriazinesPlasmodium falciparumBase SequenceMolecular Sequence DataPneumocystisDapsoneMutationSarcoma 180PterinsPteridinesAmino Acid SequencePlasmidsModels, MolecularThymidine MonophosphatePteroylpolyglutamic AcidsHydroxymercuribenzoatesProtein ConformationDNA, ProtozoanDrug CombinationsMalaria, FalciparumCell LineBinding SitesCHO CellsMoritellaCloning, MolecularPneumocystis cariniiFormyltetrahydrofolatesOvaryDNAR FactorsStructure-Activity RelationshipPoint MutationBiopterinDNA Restriction EnzymesNucleic Acid HybridizationPeptide SynthasesProtein BindingGenes, ProtozoanQuinazolinonesDrug Resistance, MicrobialDeoxyuridinePhosphoribosylaminoimidazolecarboxamide Formyltransferase4-Aminobenzoic AcidDNA, RecombinantKB CellsTranscription, GeneticDihydropteridine ReductaseParasitic Sensitivity TestsPyrimidinesQuinazolinesPhosphoribosylglycinamide FormyltransferaseHydroxymethyl and Formyl TransferasesRNA, MessengerFloxuridinePlasmodium vivaxPolymerase Chain ReactionCrystallography, X-RayProtein Denaturationp-Chloromercuribenzoic AcidLeishmania tropicaMolecular StructureThermodynamicsCatalysisDNA ReplicationProtein FoldingUreaLigandsToxoplasmaRecombinant ProteinsEnzyme StabilityPneumocystis InfectionsTrimethoprim-Sulfamethoxazole CombinationProtozoan ProteinsRestriction Mapping