MethionineCystathionineCystathionine beta-SynthaseCystathionine gamma-LyaseSulfurHomocysteineCysteine SynthaseCarbon-Oxygen LyasesHyperhomocysteinemiaS-AdenosylmethionineCysteineBetaine-Homocysteine S-MethyltransferaseHomocystinuriaAmino Acids, SulfurVitamin B 6 DeficiencyMethionine AdenosyltransferaseVitamin B 6Folic AcidGlycine N-MethyltransferaseS-AdenosylhomocysteineVitamin B 12MethylationLyasesPyridoxal PhosphateHydrogen SulfideSulfur CompoundsGlutathione5-Methyltetrahydrofolate-Homocysteine S-MethyltransferaseMethionine Sulfoxide ReductasesCystineHomocystineAlkynesMethylenetetrahydrofolate Reductase (NADPH2)Sulfur RadioisotopesVitamin B ComplexLiverDietSerineOxidoreductases Acting on CH-NH Group DonorsCarbon IsotopesVitamin B 12 DeficiencyFolic Acid DeficiencyKineticsBetaineMethionyl AminopeptidasesMolecular Sequence DataMethylmalonic AcidTetrahydrofolatesHomocysteine S-MethyltransferasePyridoxineCloning, Molecular5,10-Methylenetetrahydrofolate Reductase (FADH2)Rats, Sprague-DawleyAmino AcidsDietary SupplementsMethionine-tRNA LigaseAdenosylhomocysteinaseMethyltransferasesEthionineVitamin B DeficiencyTranscobalaminsMethionine SulfoximineSarcosineRisk FactorsFerredoxin-NADP ReductaseCholineEnkephalin, MethionineLipotropic AgentsOxidation-ReductionAminopeptidasesVitamin UAmino Acid SequenceGenotypeSulfhydryl CompoundsCholine DeficiencyPolymorphism, GeneticThionucleosidesCysteic AcidBiological MarkersPhosphatidylethanolamine N-MethyltransferaseMutationEscherichia coliChromatography, High Pressure LiquidOxidoreductasesMethylenetetrahydrofolate Dehydrogenase (NAD+)Food, FortifiedCardiovascular DiseasesNeural Tube DefectsCase-Control StudiesFastingVascular DiseasesRiboflavinBase SequenceDose-Response Relationship, DrugEndothelium, VascularIsoleucineOxidative StressNutritional RequirementsCarbon-Sulfur LyasesMethylenetetrahydrofolate Dehydrogenase (NADP)