Neural TubePolymorphism, GeneticPolymorphism, Single NucleotideNeurulationAnencephalyGenetic Predisposition to DiseaseGene FrequencyNeural CrestAllelesSpinal DysraphismChick EmbryoNervous SystemNotochordCase-Control StudiesHaplotypesCentral Nervous SystemPollen TubeGene Expression Regulation, DevelopmentalFolic AcidGenotypeNeural Tube DefectsPolymerase Chain ReactionBody PatterningQuailIn Situ HybridizationGenetic Association StudiesMolecular Sequence DataPolymorphism, Single-Stranded ConformationalLinkage DisequilibriumSpina Bifida OccultaBase SequenceCoturnixAsian Continental Ancestry GroupRhombencephalonPregnancyHedgehog ProteinsSomitesGenetic VariationPhenotypeHomozygoteMorphogenesisEctodermFallopian TubesEmbryonic InductionEmbryo, MammalianPaired Box Transcription FactorsMethylenetetrahydrofolate Reductase (NADPH2)MesodermSequence Analysis, DNARisk FactorsMutationMeningomyeloceleGenetic MarkersEncephaloceleHomeodomain ProteinsEustachian TubeTranscription FactorsHeterozygoteSpina Bifida CysticaChest TubesEmbryonic and Fetal DevelopmentEmbryo, NonmammalianDNA PrimersVitamin B ComplexChinaEuropean Continental Ancestry GroupPromoter Regions, GeneticZebrafish ProteinsAvian ProteinsEmbryonic DevelopmentAmplified Fragment Length Polymorphism AnalysisNerve Tissue ProteinsSpinal CordPreconception CareDNA-Binding ProteinsOdds RatioZebrafishCell DifferentiationNeural PlateTissue TransplantationExonsChromosome MappingBone Morphogenetic ProteinsCranial NervesAmino Acid SequencePrenatal DiagnosisMesencephalonSignal TransductionCell MovementCongenital AbnormalitiesPhylogenyWnt3 ProteinDNA Mutational AnalysisXenopus ProteinsModels, GeneticMice, Mutant StrainsGastrulaDNAProteinsFolic Acid Deficiency