HyperhomocysteinemiaVitamin B 12Folic AcidEnzymesHomocystineCystathionine beta-SynthaseMethylenetetrahydrofolate Reductase (NADPH2)BiocatalysisMethionineS-AdenosylmethionineVitamin B ComplexVitamin B 6Betaine-Homocysteine S-MethyltransferaseCystathionineCatalysis5-Methyltetrahydrofolate-Homocysteine S-MethyltransferaseDithioerythritolMethylmalonate-Semialdehyde Dehydrogenase (Acylating)Substrate SpecificityKineticsS-AdenosylhomocysteinePyridoxal PhosphateHomocystinuriaOxidoreductases Acting on CH-NH Group DonorsBiosynthetic PathwaysVitamin B 12 DeficiencyFolic Acid DeficiencyModels, MolecularAcyltransferasesMethylmalonic AcidOxidation-ReductionMolecular Sequence DataModels, ChemicalBetaineAmino Acid SequenceHomocysteine S-MethyltransferasePyridoxineCatalytic Domain5,10-Methylenetetrahydrofolate Reductase (FADH2)Glycine N-MethyltransferaseTetrahydrofolatesCysteineDietary SupplementsMolecular StructureAcyl Coenzyme AOxidoreductasesRisk FactorsIron-Sulfur ProteinsBinding SitesAdenosylhomocysteinaseHydrogen-Ion ConcentrationFree RadicalsVitamin B DeficiencyTranscobalaminsEscherichia coliHydrolysisVitamin B 6 DeficiencyCrystallography, X-RayProtein ConformationSequence Homology, Amino AcidProtein Structure, TertiarySarcosineModels, BiologicalBacterial ProteinsMethylationSpectrophotometryCystathionine gamma-LyaseBiological MarkersMutationEnzyme InhibitorsStructure-Activity RelationshipGenotypeLipotropic AgentsCardiovascular DiseasesPolymorphism, GeneticCloning, MolecularVascular DiseasesCysteic AcidProtein BindingCase-Control StudiesDietRecombinant ProteinsMethylenetetrahydrofolate Dehydrogenase (NAD+)FastingPhylogenyMethyltransferasesPhosphatidylethanolamine N-MethyltransferaseFluorescence Polarization ImmunoassaySequence AlignmentBacteriaEnzyme ActivationMagnesiumAdenosine TriphosphateSulfhydryl CompoundsEndothelium, VascularCholineFerredoxin-NADP ReductaseNeural Tube DefectsReference ValuesRiboflavin