Embryonic DevelopmentCloning, MolecularEmbryo, MammalianEmbryo, NonmammalianChick EmbryoGene Expression Regulation, DevelopmentalClone CellsMolecular Sequence DataEmbryonic and Fetal DevelopmentBase SequenceBlastocystAmino Acid SequenceEmbryo ImplantationEmbryo LossDNA, ComplementaryIn Situ HybridizationZebrafishSequence Homology, Amino AcidPregnancyRNA, MessengerOocytesZygoteCloning, OrganismFertilization in VitroZebrafish ProteinsBody PatterningMorphogenesisTranscription FactorsBlastomeresMesodermCell DifferentiationCleavage Stage, OvumMutationHomeodomain ProteinsDNAGastrulaSequence AlignmentPhenotypeMorulaGene ExpressionXenopus ProteinsSequence Analysis, DNADNA PrimersSignal TransductionBlotting, NorthernTranscription, GeneticPolymerase Chain ReactionSequence Homology, Nucleic AcidNervous SystemEctodermNuclear Transfer TechniquesCell LineGenes, LethalDrosophilaDrosophila ProteinsXenopus laevisDNA-Binding ProteinsFertilizationChromosome MappingTime FactorsGene TargetingReverse Transcriptase Polymerase Chain ReactionTissue DistributionPhylogenyCulture TechniquesMice, KnockoutParthenogenesisEndodermXenopusOvumAnimals, Genetically ModifiedMice, Inbred C57BLYolk SacBlotting, SouthernOrganogenesisEctogenesisCryopreservationGenesImmunohistochemistryRecombinant ProteinsPlasmidsEmbryonic Stem CellsNucleic Acid HybridizationDevelopmental BiologyDrosophila melanogasterSomitesOrgan SpecificityOogenesisGene LibraryEmbryo DispositionMice, TransgenicStem CellsGene Expression RegulationNeural CrestRestriction MappingCattleEscherichia coliChimeraGenes, HomeoboxCell Lineage