OocytesEmbryonic DevelopmentEmbryo, MammalianBlastocystEmbryo ImplantationEmbryonic and Fetal DevelopmentPregnancyEmbryo, NonmammalianEmbryo LossChick EmbryoYolk SacGene Expression Regulation, DevelopmentalDeciduaParthenogenesisGerm LayersTrophoblastsMorulaCochlear ImplantationZygoteUterusIn Situ HybridizationBlastomeresEmbryo TransferOocyte DonationEmbryo Implantation, DelayedOogenesisTime FactorsGastrulaChimeraEmbryo Culture TechniquesFertilization in VitroFetal DeathTeratogensGenes, LethalCulture TechniquesEctodermMice, Inbred CBAXenopus laevisCleavage Stage, OvumNuclear Transfer TechniquesOocyte RetrievalMice, Inbred ICREndodermRNA, MessengerPregnancy, AnimalCryopreservationAbnormalities, Drug-InducedMeiosisMolecular Sequence DataMice, Inbred C57BLMorphogenesisPlacentaMice, Inbred StrainsCochlear ImplantsSperm Injections, IntracytoplasmicIn Vitro Oocyte Maturation TechniquesXenopusLens Implantation, IntraocularCell DifferentiationFertilizationProsthesis DesignPregnancy RateBase SequenceGestational AgeTreatment OutcomeMicroinjectionsCloning, OrganismProgesteroneExtraembryonic MembranesGene ExpressionImmunohistochemistryMesodermPolyploidyEndometriumOvumFertilityLitter SizeGenomic ImprintingCumulus CellsOvaryMetaphasePacemaker, ArtificialStem CellsZona PellucidaAmino Acid SequenceCulture MediaCrosses, GeneticTranscription FactorsCells, CulturedStentsMice, Mutant StrainsMice, TransgenicSpermatozoaOvulation InductionSperm-Ovum InteractionsCell CountEctogenesisEmbryonic Stem CellsVitrificationPhenotype