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Embryo, MammalianFetusFetal Tissue TransplantationChick EmbryoComplicityAborted FetusEmbryo, NonmammalianResearchPregnancyDirected Tissue DonationMaternal-Fetal ExchangePlacentaLifePersonhoodEmbryo ImplantationBeginning of Human LifeAbortion, VeterinaryCulture TechniquesCell Transformation, NeoplasticMesocricetusBlastocystEmbryonic and Fetal DevelopmentGestational AgeEmbryonic DevelopmentCricetinaeFetal ResearchGene Expression Regulation, DevelopmentalResearch Support as TopicResearch DesignPregnancy, AnimalEthics, ResearchCells, CulturedBenzopyrenesResearch PersonnelCell LineCivil RightsEmbryo LossBenz(a)AnthracenesNontherapeutic Human ExperimentationCell Transformation, ViralMolecular Sequence DataTherapeutic Human ExperimentationBase SequenceRNA, MessengerNursing ResearchPregnant WomenAbortion, InducedExtraembryonic MembranesFertilization in VitroAmniotic FluidRabies VaccinesBrain Tissue TransplantationTime FactorsDNACleavage Stage, OvumTissue DistributionBlastomeresFetal DeathOncogenic VirusesAvian Sarcoma VirusesYolk SacBenzo(a)pyreneFetal DiseasesFetal ViabilityHealth Services ResearchEmbryo ResearchTranslational Medical ResearchIn Situ HybridizationLiverEthics, MedicalSocial Control, FormalFetal ResorptionHydrops FetalisVirus CultivationEmbryo DispositionUterusFetal WeightGenetic ResearchTrophoblastsNewcastle disease virusMoral ObligationsMethylcholanthreneUridineAdvisory CommitteesCell DifferentiationMutationPhenotypeFluorescent Antibody TechniqueArbovirusesZygoteAmino Acid SequenceCulture MediaTritiumMorulaFetal DevelopmentRabiesZebrafishAbortion, LegalInformed ConsentCryopreservation