Cysteine DioxygenaseCysteineSulfur CompoundsTaurineDioxygenasesSulfatesCarboxy-LyasesGlutathioneHyperhomocysteinemiaVitamin B 12Folic AcidCystathionine beta-SynthaseHomocystineMethionineMethylenetetrahydrofolate Reductase (NADPH2)Cysteine EndopeptidasesCysteine ProteasesVitamin B ComplexVitamin B 6CystathionineBetaine-Homocysteine S-MethyltransferaseEnergy MetabolismLipid Metabolism5-Methyltetrahydrofolate-Homocysteine S-MethyltransferaseS-AdenosylhomocysteineCysteine SynthaseHomocystinuriaOxidoreductases Acting on CH-NH Group DonorsCysteine Proteinase InhibitorsMolecular Sequence DataVitamin B 12 DeficiencyFolic Acid DeficiencyAmino Acid SequenceOxidation-ReductionS-AdenosylmethionineSulfhydryl CompoundsLiverBetaineMethylmalonic AcidKineticsDisulfidesMetabolismChromatography, High Pressure LiquidGlucoseHomocysteine S-MethyltransferasePyridoxineSulfurCystathionine gamma-LyaseDietary SupplementsMutationCystine5,10-Methylenetetrahydrofolate Reductase (FADH2)Glycine N-MethyltransferaseTetrahydrofolatesRisk FactorsAdenosylhomocysteinaseVitamin B DeficiencyAmino Acids, SulfurMethylationDietBase SequenceGenotypeMutagenesis, Site-DirectedBiological MarkersTime FactorsVitamin B 6 DeficiencyDose-Response Relationship, DrugCells, CulturedTranscobalaminsCystatinsBiotransformationRecombinant ProteinsMetabolic Networks and PathwaysEscherichia coliFastingPolymorphism, GeneticCarbon-Sulfur LyasesCathepsinsSarcosineModels, BiologicalSequence Homology, Amino AcidBinding SitesOxidative StressLyasesDipeptidesPyridoxal PhosphateMicrosomes, LiverCholineCytochrome P-450 Enzyme SystemLipidsCysteic AcidRNA, MessengerProtein BindingCase-Control StudiesModels, MolecularCell LineCholesterolMetabolism, Inborn ErrorsMethyltransferasesLipotropic Agents