Embryo ResearchCloning, OrganismSperm-Ovum InteractionsFertilization in VitroEmbryo, MammalianEmbryo ImplantationBlastocystBlastomeresEmbryonic DevelopmentEmbryo, NonmammalianChick EmbryoEmbryonic and Fetal DevelopmentPersonhoodBeginning of Human LifePregnancyEmbryo DispositionCryopreservationEgg YolkEmbryo TransferEmbryo Culture TechniquesZygoteOvumPregnancy RateGene Expression Regulation, DevelopmentalLifePreimplantation DiagnosisEgg ProteinsCulture TechniquesValue of LifeMosaicismAnatomy, ArtisticEmbryologyTheologyEgg ShellMorulaEctogenesisOocytesIncubatorsSperm Injections, IntracytoplasmicFertilizationEgg WhiteSingle Embryo TransferFetal ResearchPrenatal InjuriesResearch Embryo CreationEthylene GlycolEmbryo LossCryoprotective AgentsFetal ViabilityMoralsGestational AgeCleavage Stage, OvumReproductive TechniquesVitrificationHuman CharacteristicsAneuploidyZona PellucidaTrophoblastsGamete Intrafallopian TransferPregnancy OutcomeYolk SacParasite Egg CountMesodermMorphogenesisGerm LayersIn Situ HybridizationCulture MediaCatholicismThiepinsTime FactorsTotipotent Stem CellsFetusNontherapeutic Human ExperimentationEastern OrthodoxyEmbryonic Stem CellsPropylene GlycolChromosome AberrationsEndometriumReproductive Techniques, AssistedZebrafishMolecular Sequence DataBones of Upper ExtremityNotochordGastrulaFallopian TubesEgg HypersensitivityBody PatterningRNA, MessengerCell DifferentiationCell NucleusHomeodomain ProteinsPhilosophy, MedicalOvipositionInfertility, FemaleIn Situ Hybridization, FluorescenceImmunohistochemistryCell LineTissue SurvivalBase SequenceTranscription Factors