Embryonic DevelopmentGene Expression Regulation, DevelopmentalEmbryo, MammalianEmbryonic and Fetal DevelopmentEmbryo, NonmammalianMolecular Sequence DataMammalsBlastocystAmino Acid SequenceIn Situ HybridizationBase SequenceZebrafishEmbryo LossTranscription FactorsOocytesSignal TransductionRNA, MessengerZebrafish ProteinsChick EmbryoSequence Homology, Amino AcidPregnancyMorphogenesisZygoteCloning, MolecularMutationCell LineHomeodomain ProteinsBody PatterningMice, KnockoutMesodermCell DifferentiationDNA, ComplementaryPhenotypeGene TargetingDNA-Binding ProteinsCells, CulturedGenes, LethalDrosophila ProteinsNervous SystemOrganogenesisDrosophilaMice, Inbred C57BLMice, TransgenicXenopus ProteinsEmbryonic Stem CellsSequence AlignmentGene ExpressionModels, BiologicalTranscription, GeneticFertilizationTime FactorsEmbryo Culture TechniquesImmunohistochemistryDevelopmental BiologyStem CellsProtein BindingXenopus laevisOvumNuclear ProteinsReverse Transcriptase Polymerase Chain ReactionGastrulaGene Expression RegulationCarrier ProteinsDNA PrimersOogenesisDrosophila melanogasterProteinsTissue DistributionFertilization in VitroMembrane ProteinsAnimals, Genetically ModifiedDNAProtein Structure, TertiaryWnt ProteinsMice, Mutant StrainsOrgan SpecificityPhylogenyYolk SacHedgehog ProteinsSpermatozoaNeuronsXenopusGene Expression ProfilingTransfectionEctodermNerve Tissue ProteinsCell NucleusRepressor ProteinsHeLa CellsCattleCricetinaeCentral Nervous SystemGastrulationCell LineageEmbryo ImplantationMorulaTrans-ActivatorsCell MovementSpecies SpecificityBlastula