Neural Tube DefectsNeural TubeAnencephalyFolic AcidSpinal DysraphismSpina Bifida OccultaNeurulationSpina Bifida CysticaFolic Acid DeficiencyEncephalocelePregnancyVitamin B ComplexMeningomyelocelePreconception CareFolate Receptors, GPI-AnchoredFood, FortifiedPrenatal DiagnosisCongenital AbnormalitiesVitamin B 12Folate Receptor 1HomocysteineAbortion, Therapeuticalpha-FetoproteinsDietary SupplementsReduced Folate Carrier ProteinInfant, NewbornNeural CrestNervous SystemMethylenetetrahydrofolate Reductase (NADPH2)TetrahydrofolatesAir Pollution, RadioactivePrenatal CareAmniocentesisEmbryo, MammalianGene Expression Regulation, DevelopmentalAmniotic FluidMouth AbnormalitiesIrelandVitamin B 12 DeficiencyFlourCentral Nervous SystemChick EmbryoFetal DeathPaired Box Transcription FactorsTailZinebMethylenetetrahydrofolate Dehydrogenase (NADP)Mice, Mutant StrainsIn Situ HybridizationEmbryonic and Fetal DevelopmentVitaminsBody PatterningMolecular Sequence DataNotochordMutationCase-Control StudiesEmbryonic DevelopmentThymidine MonophosphateFormate-Tetrahydrofolate LigasePregnancy in DiabeticsPregnancy ComplicationsFetal DiseasesManebTranscription FactorsPhenotypeMorphogenesisGestational AgePrenatal Nutritional Physiological PhenomenaTeratogensDeanolPollen TubeBreadMaternal ExposureBase SequenceTranscobalaminsAmino Acid SequenceHomeodomain ProteinsProton-Coupled Folate TransporterOxidoreductases Acting on CH-NH Group DonorsAbnormalities, Drug-InducedGenotypeRisk FactorsCleft LipAbortion, InducedAbnormalities, MultipleHeart Defects, CongenitalMaternal Nutritional Physiological PhenomenaPregnancy Trimester, SecondDietPregnancy Trimester, FirstCraniofacial AbnormalitiesPrevalenceThiocholineRiskMeningoceleHomozygote5-Methyltetrahydrofolate-Homocysteine S-MethyltransferaseDown SyndromeCleft PalateQuail