Embryo, MammalianEmbryo ImplantationBlastocystBlastomeresEmbryo ResearchEmbryonic DevelopmentEmbryo, NonmammalianClone CellsFertilization in VitroChick EmbryoEmbryonic and Fetal DevelopmentPersonhoodBeginning of Human LifePregnancyEmbryo DispositionCryopreservationEgg YolkEmbryo TransferEmbryo Culture TechniquesZygoteOvumPregnancy RateGene Expression Regulation, DevelopmentalLifePreimplantation DiagnosisEgg ProteinsCulture TechniquesValue of LifeMosaicismAnatomy, ArtisticEmbryologyTheologyMolecular Sequence DataEgg ShellOocytesMorulaEctogenesisIncubatorsSperm Injections, IntracytoplasmicFertilizationCloning, OrganismEgg WhiteBase SequenceSingle Embryo TransferFetal ResearchPrenatal InjuriesResearch Embryo CreationEthylene GlycolEmbryo LossCloning, MolecularAmino Acid SequenceCryoprotective AgentsFetal ViabilityMoralsGestational AgeCleavage Stage, OvumReproductive TechniquesVitrificationHuman CharacteristicsAneuploidyZona PellucidaTrophoblastsRNA, MessengerGamete Intrafallopian TransferPregnancy OutcomeYolk SacIn Situ HybridizationParasite Egg CountCulture MediaMesodermMorphogenesisTime FactorsCell LineGerm LayersFetusCatholicismDNA, ComplementaryThiepinsTotipotent Stem CellsNontherapeutic Human ExperimentationChromosome AberrationsEmbryonic Stem CellsDNAEastern OrthodoxyCell DifferentiationPropylene GlycolZebrafishEndometriumReproductive Techniques, AssistedNotochordGastrulaBones of Upper ExtremityCell NucleusIn Situ Hybridization, FluorescenceFallopian TubesBody PatterningEgg HypersensitivityHomeodomain ProteinsMutationPhenotype