Embryo, MammalianEmbryo, NonmammalianChick EmbryoBlastocystEmbryo ImplantationEmbryonic DevelopmentEmbryonic and Fetal DevelopmentGene Expression Regulation, DevelopmentalCleavage Stage, OvumEmbryo LossBlastomeresPregnancyMorulaFertilization in VitroZygoteIn Situ HybridizationMolecular Sequence DataGastrulaBody PatterningCulture TechniquesMesodermMammalsMorphogenesisEndodermBase SequenceOocytesEctogenesisEctodermCryopreservationAmino Acid SequenceTranscription FactorsEmbryo DispositionZebrafishRNA, MessengerMice, Inbred ICRHomeodomain ProteinsCloning, OrganismMice, Inbred StrainsNuclear Transfer TechniquesFetal ViabilityMutationSignal TransductionParthenogenesisZebrafish ProteinsCell LineMice, Inbred C57BLCell DifferentiationTime FactorsDNA-Binding ProteinsEmbryo ResearchSingle Embryo TransferSomitesYolk SacCloning, MolecularChimeraSequence Homology, Amino AcidEmbryonic InductionPhenotypeXenopus ProteinsNervous SystemGene ExpressionMice, TransgenicMice, KnockoutGerm LayersFertilizationDrosophilaDrosophila ProteinsCell LineageMicroinjectionsPregnancy RateNeural CrestMice, Mutant StrainsDNA, ComplementaryCell NucleusEmbryo Culture TechniquesMice, Inbred CBATranscription, GeneticSperm Injections, IntracytoplasmicNodal ProteinProteinsCulture MediaGenes, LethalSuperovulationDNANotochordAnimals, Genetically ModifiedImmunohistochemistryModels, BiologicalSeedsGestational AgeTrophoblastsCattleNuclear ProteinsGerm CellsXenopus laevisDNA PrimersTeratogensXenopusStem CellsSea Urchins