Embryo, MammalianEmbryo ImplantationEmbryo, NonmammalianBlastocystChick EmbryoEmbryonic DevelopmentBlastomeresEmbryo ResearchFertilization in VitroEmbryonic and Fetal DevelopmentPregnancyEmbryo DispositionCryopreservationPersonhoodBeginning of Human LifeGene Expression Regulation, DevelopmentalZygoteEmbryo LossPregnancy RateMorulaEmbryo TransferEmbryo Culture TechniquesCulture TechniquesPreimplantation DiagnosisEctogenesisCleavage Stage, OvumSingle Embryo TransferOocytesSperm Injections, IntracytoplasmicCloning, OrganismLifeMosaicismEmbryologyValue of LifeAnatomy, ArtisticTheologyIncubatorsFetal ViabilityIn Situ HybridizationResearch Embryo CreationMesodermMorphogenesisZebrafishPrenatal InjuriesEthylene GlycolGestational AgeFetal ResearchVitrificationGastrulaCryoprotective AgentsReproductive TechniquesBody PatterningYolk SacFertilizationPregnancy OutcomeAneuploidyTrophoblastsMoralsTime FactorsGerm LayersCulture MediaHuman CharacteristicsZona PellucidaMolecular Sequence DataHomeodomain ProteinsNotochordNuclear Transfer TechniquesGamete Intrafallopian TransferRNA, MessengerEctodermCell DifferentiationZebrafish ProteinsTranscription FactorsEmbryonic Stem CellsTotipotent Stem CellsFetusFallopian TubesBase SequenceEndometriumPropylene GlycolCatholicismCell NucleusXenopus ProteinsThiepinsChromosome AberrationsNontherapeutic Human ExperimentationSeedsImmunohistochemistryEndodermEastern OrthodoxyParthenogenesisInfertility, FemaleDrosophilaEmbryonic InductionCell LineageMutationBlastodermSea UrchinsAmino Acid SequenceDrosophila Proteins