Methylenetetrahydrofolate Reductase (NADPH2)5,10-Methylenetetrahydrofolate Reductase (FADH2)Oxidoreductases Acting on CH-NH Group DonorsMethylenetetrahydrofolate Dehydrogenase (NADP)HomocysteineMethylenetetrahydrofolate Dehydrogenase (NAD+)Folic AcidTetrahydrofolatesPolymorphism, GeneticGenotype5-Methyltetrahydrofolate-Homocysteine S-MethyltransferaseHyperhomocysteinemiaVitamin B 12Ferredoxin-NADP ReductaseHomozygoteFactor VGenetic Predisposition to DiseaseCystathionine beta-SynthaseThymidylate SynthaseThrombophiliaCase-Control StudiesFolic Acid DeficiencyGene FrequencyGlycine HydroxymethyltransferaseRiboflavinFlavin-Adenine DinucleotideHomocystinuriaHomocystineProthrombinOxidoreductasesAllelesPolymorphism, Single NucleotideRisk FactorsMethionineAminohydrolasesVitamin B ComplexFormate-Tetrahydrofolate LigaseMacedonia (Republic)Point MutationS-AdenosylmethionineMutationVitamin B 6ThymineMethenyltetrahydrofolate CyclohydrolaseOdds RatioNeural Tube DefectsBetaineFertility Agents, MaleFMN ReductaseReduced Folate Carrier ProteinNitrate ReductasesCytosineNADPPolymerase Chain ReactionAsian Continental Ancestry GroupSpinal DysraphismMethotrexateAbortion, HabitualHydroxymethylglutaryl CoA ReductasesPolymorphism, Restriction Fragment LengthAmino Acid Metabolism, Inborn ErrorsTranscobalaminsRibonucleotide ReductasesPyridoxineDietary SupplementsAlcohol OxidoreductasesDietColorectal NeoplasmsFluorodeoxyuridylateCytochrome-B(5) ReductaseNitrite ReductasesHeterozygoteDeoxyribodipyrimidine Photo-LyaseChinaDNA Mutational AnalysisDNA MethylationGenetic Association StudiesGlutathione ReductaseKineticsThioredoxin-Disulfide ReductaseTetrahydrofolate DehydrogenaseConfidence IntervalsNADPH-Ferrihemoprotein ReductaseGenetic VariationOxidation-ReductionPharmacogeneticsPteroylpolyglutamic AcidsRiskBase SequencePregnancyMolecular Sequence DataCytochrome ReductasesOxidoreductases Acting on CH-CH Group DonorsVascular DiseasesDihydropteridine ReductaseEnzyme StabilityHaplotypesJapanFlavinsReference Values