Embryo, MammalianBlastocystEmbryo, NonmammalianChick EmbryoEmbryonic DevelopmentEmbryonic and Fetal DevelopmentEmbryo ImplantationGene Expression Regulation, DevelopmentalCleavage Stage, OvumMorulaBlastomeresPregnancyEmbryo LossIn Situ HybridizationZygoteGastrulaEndodermBody PatterningMesodermFertilization in VitroCulture TechniquesEctogenesisEctodermMorphogenesisMice, Inbred ICRMice, Inbred StrainsCryopreservationEmbryo Culture TechniquesHomeodomain ProteinsTranscription FactorsFetal ViabilityOocytesCell DifferentiationCloning, OrganismMolecular Sequence DataZebrafishSomitesMice, Inbred C57BLRNA, MessengerParthenogenesisEmbryo DispositionNuclear Transfer TechniquesBase SequenceYolk SacGerm LayersChimeraMice, Inbred CBAMice, TransgenicMice, Mutant StrainsNodal ProteinCell LineageEmbryonic InductionMice, KnockoutTime FactorsNeural CrestSignal TransductionZebrafish ProteinsDNA-Binding ProteinsNervous SystemMutationTrophoblastsPhenotypeGestational AgeGenes, LethalEmbryo ResearchSingle Embryo TransferAmino Acid SequenceBlastocyst Inner Cell MassCulture MediaNeural Tube DefectsMesonephrosMicroinjectionsSuperovulationXenopus ProteinsFertilizationTeratogensGene ExpressionNotochordRhombencephalonFibroblastsGerm CellsCell DivisionStem CellsGenes, HomeoboxCells, CulturedImmunohistochemistrySperm Injections, IntracytoplasmicExtremitiesPregnancy RateCell NucleusFallopian TubesGastrulationGenomic ImprintingBone Morphogenetic ProteinsOrgan Culture TechniquesCell LineProteinsHomozygoteTrans-ActivatorsLac Operon