Embryo, MammalianEmbryo, NonmammalianChick EmbryoBlastocystEmbryonic DevelopmentEmbryo ImplantationGene Expression Regulation, DevelopmentalEmbryonic and Fetal DevelopmentZygoteBlastomeresCleavage Stage, OvumEmbryo LossFertilization in VitroOocytesPregnancyMorulaBody PatterningGastrulaIn Situ HybridizationZebrafishXenopus ProteinsMesodermEmbryo DispositionMorphogenesisMolecular Sequence DataCryopreservationEctodermEctogenesisFertilizationDrosophila ProteinsXenopus laevisDrosophilaCulture TechniquesZebrafish ProteinsCloning, OrganismOogenesisNuclear Transfer TechniquesHomeodomain ProteinsRNA, MessengerOvumBlastodermBase SequenceEndodermTranscription FactorsXenopusRNA, Messenger, StoredParthenogenesisAmino Acid SequenceEmbryonic InductionSea UrchinsDrosophila melanogasterEmbryo ResearchGerm CellsSingle Embryo TransferMicroinjectionsAnimals, Genetically ModifiedCaenorhabditis elegansSeedsSperm Injections, IntracytoplasmicCaenorhabditis elegans ProteinsCell DifferentiationNervous SystemPregnancy RateFallopian TubesNotochordMutationSuperovulationTime FactorsCell NucleusUrochordataEmbryologyPhenotypeEmbryo Culture TechniquesSignal TransductionDNA-Binding ProteinsFetal ViabilityGenes, InsectSpermatozoaGenes, HomeoboxSequence Homology, Amino AcidGastrulationChimeraCloning, MolecularCattleNodal ProteinCumulus CellsMice, Inbred StrainsMitosisMice, Inbred ICRDNA, ComplementaryGene ExpressionGenomic ImprintingCell LineageGerm LayersPreimplantation DiagnosisSomitesGenes, LethalZona PellucidaNeural CrestCytoplasm