Embryonic DevelopmentGene Expression Regulation, DevelopmentalEmbryonic and Fetal DevelopmentEmbryo, MammalianEmbryo, NonmammalianMolecular Sequence DataBase SequenceBlastocystIn Situ HybridizationZebrafishEmbryo LossRNA, MessengerOocytesChick EmbryoRNAZebrafish ProteinsRNA, UntranslatedPregnancyZygoteCell DifferentiationTranscription FactorsAmino Acid SequenceMorphogenesisHomeodomain ProteinsBody PatterningMesodermSignal TransductionTranscription, GeneticMutationGenes, LethalGene TargetingPhenotypeMice, KnockoutCloning, MolecularRNA, ViralNervous SystemOrganogenesisNucleic Acid ConformationXenopus ProteinsEmbryonic Stem CellsDNA, ComplementaryRNA, Small UntranslatedDrosophila ProteinsEmbryo Culture TechniquesRNA, Small InterferingDevelopmental BiologyRNA InterferenceDrosophilaReverse Transcriptase Polymerase Chain ReactionGene Expression ProfilingGastrulaFertilizationOogenesisXenopus laevisSequence Homology, Amino AcidOvumCell LineDNA-Binding ProteinsFertilization in VitroMice, TransgenicCells, CulturedMice, Inbred C57BLRNA-Binding ProteinsDrosophila melanogasterGene ExpressionStem CellsImmunohistochemistryGene Expression RegulationTime FactorsYolk SacDNA PrimersBlotting, NorthernWnt ProteinsModels, BiologicalGastrulationEctodermBlastulaRNA, AntisenseSequence AlignmentMorulaHedgehog ProteinsEmbryo ImplantationMice, Mutant StrainsSomitesXenopusGenes, HomeoboxRibonuclease IIIEndodermCell MovementAnimals, Genetically ModifiedNeural TubeCell NucleusTissue DistributionNeural CrestRNA Processing, Post-TranscriptionalParthenogenesisNuclear ProteinsSequence Analysis, RNACell LineageCentral Nervous System