Multiple Birth OffspringTissue DonorsOocyte DonationReproductive Techniques, AssistedOvuleBirth RateOvumCadaverAlstroemeriaGerm Cells, PlantCord Blood Stem Cell TransplantationUrochordataFertilizationEmbryo, MammalianFetal BloodGraft SurvivalEmbryo, NonmammalianPregnancySeedsChick EmbryoPollen TubeAgingEndospermStarfishRosaEgg YolkPollenPhloroglucinolBlood DonorsAge FactorsFlowersLiving DonorsEmbryo ImplantationCells, CulturedBlastocystArabidopsisEgg ProteinsEmbryonic DevelopmentEgg ShellArabidopsis ProteinsGene Expression Regulation, PlantEgg WhiteZea maysEmbryonic and Fetal DevelopmentGene Expression Regulation, DevelopmentalEmbryo LossPlant ProteinsFertilization in VitroGenes, PlantCleavage Stage, OvumZygoteBlastomeresReproductionParasite Egg CountOocytesEmbryo DispositionMorulaPotassiumCryopreservationCell MembraneZebrafishMembrane PotentialsGastrulaCloning, OrganismMolecular Sequence DataEgg HypersensitivityBody PatterningIn Situ HybridizationNuclear Transfer TechniquesOvipositionMorphogenesisTime FactorsCulture TechniquesEmbryo ResearchMesodermParthenogenesisSingle Embryo TransferXenopus ProteinsSpermatozoaEctogenesisEctodermPregnancy RateBase SequenceTissue and Organ ProcurementZebrafish ProteinsRNA, MessengerAmino Acid SequenceXenopus laevisXenopusMicroinjectionsSperm-Ovum InteractionsTransplantation, HomologousVitelline MembraneSperm Injections, IntracytoplasmicDrosophilaHomeodomain ProteinsChimeraBlastodermDrosophila ProteinsTranscription Factors