Folic AcidFolate Receptors, GPI-AnchoredReduced Folate Carrier ProteinFolic Acid DeficiencyFolate Receptor 1TetrahydrofolatesVitamin B 12Proton-Coupled Folate TransporterHomocysteinePteroylpolyglutamic AcidsVitamin B ComplexMethylenetetrahydrofolate Reductase (NADPH2)Folate Receptor 2Folic Acid Antagonistsgamma-Glutamyl HydrolaseVitamin B 6Neural Tube DefectsVitamin B 12 DeficiencyFormyltetrahydrofolatesDietary Supplements5-Methyltetrahydrofolate-Homocysteine S-Methyltransferase4-Aminobenzoic AcidDietMethotrexateFood, FortifiedFolic Acid TransportersHyperhomocysteinemiaAnemia, MacrocyticFIGLU TestNutritional StatusErythrocytesOxidoreductases Acting on CH-NH Group DonorsLactobacillus caseiAminopterinMethylmalonic AcidPolyglutamic AcidCarrier ProteinsReceptors, Cell SurfaceMethionineMembrane Transport Proteins5,10-Methylenetetrahydrofolate Reductase (FADH2)Thymidylate SynthaseMethylenetetrahydrofolate Dehydrogenase (NADP)Anemia, MegaloblasticKB CellsGlutamatesS-AdenosylmethionineNutritional Requirementspara-AminobenzoatesTetrahydrofolate DehydrogenaseGlycine HydroxymethyltransferaseSulfathiazolesNutrition PolicyFerredoxin-NADP ReductaseS-AdenosylhomocysteineLeukemia L1210Phosphoribosylaminoimidazolecarboxamide FormyltransferaseRiboflavinVitaminsTrimetrexateFormiminoglutamic AcidPolymorphism, GeneticPregnancyThymidine MonophosphateGenotypeBiological AvailabilityGlycine N-MethyltransferaseDiphosphotransferasesVitamin B DeficiencyLeucovorinDNA MethylationCase-Control StudiesHydroxymethyl and Formyl TransferasesMicronutrientsPeptide SynthasesBreadDeoxyuridineBiological TransportMethylenetetrahydrofolate Dehydrogenase (NAD+)Intestinal AbsorptionPterinsRisk FactorsBetaine-Homocysteine S-MethyltransferasePhosphoribosylglycinamide FormyltransferaseGlutamate Carboxypeptidase IICystathionine beta-SynthasePyridoxineFood AnalysisMaternal Nutritional Physiological PhenomenaTranscobalaminsMalabsorption SyndromesBetaineNutrition SurveysAnemia, PerniciousDeoxyuracil NucleotidesFormate-Tetrahydrofolate LigaseBiological AssayHematinicsColorectal NeoplasmsLiver