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Neural Tube DefectsNeural TubeAnencephalySpinal DysraphismFolic AcidSpina Bifida OccultaNeurulationSpina Bifida CysticaEncephalocelePregnancyMeningomyelocelePreconception CareVitamin B ComplexPrenatal DiagnosisFood, FortifiedCongenital AbnormalitiesFolic Acid DeficiencyAbortion, TherapeuticInfant, Newbornalpha-FetoproteinsNeural CrestNervous SystemRisk FactorsAir Pollution, RadioactiveAmniocentesisPrenatal CareFamily HealthEmbryo, MammalianDietary SupplementsAmniotic FluidCase-Control StudiesIrelandMouth AbnormalitiesMedical History TakingGene Expression Regulation, DevelopmentalCentral Nervous SystemFetal DeathHomocysteineChick EmbryoFlourVitamin B 12TailZinebPaired Box Transcription FactorsGenetic Predisposition to DiseaseMethylenetetrahydrofolate Reductase (NADPH2)Mice, Mutant StrainsMutationEmbryonic and Fetal DevelopmentVitamin B 12 DeficiencyPrevalenceBody PatterningMethylenetetrahydrofolate Dehydrogenase (NADP)NotochordIn Situ HybridizationFetal DiseasesPregnancy ComplicationsVitaminsRiskPregnancy in DiabeticsPedigreeEmbryonic DevelopmentManebPhenotypeGestational AgeFormate-Tetrahydrofolate LigaseThymidine MonophosphateDeanolTeratogensMorphogenesisPollen TubeMaternal ExposureFolate Receptor 1GenotypePrenatal Nutritional Physiological PhenomenaCleft LipAbnormalities, MultipleGenetic CounselingAbortion, InducedAbnormalities, Drug-InducedOdds RatioHeart Defects, CongenitalTranscription FactorsFamilyTetrahydrofolatesBreadTranscobalaminsHomeodomain ProteinsPregnancy Trimester, FirstCraniofacial AbnormalitiesPregnancy Trimester, SecondHeterozygoteIncidenceCleft PalateHomozygoteCaliforniaMeningoceleThiocholineFolate Receptors, GPI-AnchoredHydrocephalus