HyperhomocysteinemiaVitamin B 12Folic AcidHomocystineCystathionine beta-SynthaseMethylenetetrahydrofolate Reductase (NADPH2)MethionineVitamin B ComplexVitamin B 6Betaine-Homocysteine S-MethyltransferaseCystathionine5-Methyltetrahydrofolate-Homocysteine S-MethyltransferaseS-AdenosylhomocysteineHomocystinuriaOxidoreductases Acting on CH-NH Group DonorsVitamin B 12 DeficiencyFolic Acid DeficiencyMethylmalonic AcidBetaineS-AdenosylmethionineHomocysteine S-MethyltransferasePyridoxine5,10-Methylenetetrahydrofolate Reductase (FADH2)Glycine N-MethyltransferaseTetrahydrofolatesCysteineDietary SupplementsRisk FactorsAdenosylhomocysteinaseVitamin B DeficiencyTranscobalaminsVitamin B 6 DeficiencySarcosineMethylationCystathionine gamma-LyaseBiological MarkersGenotypePyridoxal PhosphateLipotropic AgentsCardiovascular DiseasesPolymorphism, GeneticVascular DiseasesCysteic AcidCase-Control StudiesDietMethylenetetrahydrofolate Dehydrogenase (NAD+)FastingMethyltransferasesPhosphatidylethanolamine N-MethyltransferaseFluorescence Polarization ImmunoassaySulfhydryl CompoundsEndothelium, VascularCholineFerredoxin-NADP ReductaseNeural Tube DefectsReference ValuesRiboflavinAmino Acids, SulfurVitaminsNutritional StatusSulfurFood, FortifiedTubercidinCreatinineArteriosclerosisHematinicsDipeptidesMethionine-tRNA LigaseDose-Response Relationship, DrugCopper SulfateDouble-Blind MethodGuanidinoacetate N-MethyltransferaseMethylenetetrahydrofolate Dehydrogenase (NADP)Chromatography, High Pressure LiquidGlutathioneHomozygoteCross-Sectional StudiesNicotinamide N-MethyltransferaseLipoprotein(a)CoffeeProspective StudiesCholine DeficiencyLiverC-Reactive ProteinOxidative StressRegression AnalysisMethionine AdenosyltransferaseAnalysis of VarianceKidney Failure, ChronicCoronary DiseaseTime FactorsLipidsHydroxocobalaminCholine DehydrogenaseVitamin ULyasesThrombophiliaCells, CulturedCoronary Artery DiseaseErythrocytes