Embryo, MammalianEmbryo, NonmammalianChick EmbryoEmbryo ImplantationMetamorphosis, BiologicalBlastocystEmbryonic DevelopmentXenopus laevisGene Expression Regulation, DevelopmentalRanidaeEmbryo LossEmbryonic and Fetal DevelopmentBlastomeresFertilization in VitroCleavage Stage, OvumTailPregnancyRana catesbeianaAnuraZygoteXenopusXenopus ProteinsEmbryo DispositionIn Situ HybridizationGastrulaMorulaZebrafishBody PatterningCryopreservationOocytesBufonidaeMorphogenesisMesodermUrochordataMolecular Sequence DataAnimals, Genetically ModifiedNuclear Transfer TechniquesEmbryo ResearchEctodermSingle Embryo TransferCloning, OrganismCulture TechniquesEctogenesisRanavirusZebrafish ProteinsPregnancy RateRNA, MessengerHomeodomain ProteinsBase SequenceNotochordEthylenethioureaTranscription FactorsEndodermAmino Acid SequenceTime FactorsEmbryonic InductionSperm Injections, IntracytoplasmicSwimmingSeedsNervous SystemFetal ViabilityCell DifferentiationChytridiomycotaParthenogenesisCiona intestinalisMicroinjectionsBlastodermDrosophilaSea UrchinsDrosophila ProteinsFertilizationPreimplantation DiagnosisAmphibiansOvumThyroid HormonesPhenotypeYolk SacBufo bufoCloning, MolecularSuperovulationSignal TransductionChimeraMutationDNA, ComplementaryTectum MesencephaliGene ExpressionSomitesExtremitiesTriiodothyronineThyrotropin, beta SubunitNeural CrestCell NucleusCell LineageGenes, HomeoboxSequence Homology, Amino AcidDNA-Binding ProteinsCattleDrosophila melanogasterGerm CellsPregnancy Outcome