Embryonic DevelopmentEmbryonic and Fetal DevelopmentGene Expression Regulation, DevelopmentalEmbryo, MammalianEmbryo, NonmammalianZebrafishPregnancyPhenotypeMolecular Sequence DataAmino Acid SequenceRNA, MessengerSignal TransductionCells, CulturedBlastocystIn Situ HybridizationEmbryo LossChick EmbryoZebrafish ProteinsOocytesZygoteMorphogenesisCell DifferentiationTranscription FactorsBody PatterningMesodermHomeodomain ProteinsBase SequenceGenes, LethalMice, KnockoutGene TargetingOrganogenesisNervous SystemEmbryo Culture TechniquesDevelopmental BiologyXenopus ProteinsEmbryonic Stem CellsGastrulaMutationFertilizationFertilization in VitroDrosophila ProteinsOvumMice, TransgenicDrosophilaOogenesisMice, Inbred C57BLDNA, ComplementaryYolk SacDNA-Binding ProteinsStem CellsSequence Homology, Amino AcidImmunohistochemistryXenopus laevisEctodermBlastulaWnt ProteinsMorulaHedgehog ProteinsEmbryo ImplantationGastrulationTime FactorsSomitesCloning, MolecularReverse Transcriptase Polymerase Chain ReactionMice, Mutant StrainsEndodermAnimals, Genetically ModifiedNeural TubeNeural CrestDrosophila melanogasterParthenogenesisGenes, HomeoboxGene ExpressionCell MovementCentral Nervous SystemCell LineageEmbryologyModels, BiologicalTissue DistributionGene Expression ProfilingGerm LayersLarvaTranscription, GeneticXenopusBone Morphogenetic ProteinsHomozygoteExtremitiesDNA PrimersSpermatozoaOrgan SpecificityTrans-ActivatorsMice, Inbred ICRBlastomeresRepressor ProteinsPlacentaGestational AgeHeartEyeNuclear ProteinsFetal Proteins