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FetusFetal Tissue TransplantationComplicityAborted FetusResearchPregnancyDirected Tissue DonationPlacentaMaternal-Fetal ExchangeLifePersonhoodAbortion, VeterinaryBeginning of Human LifeEmbryo Implantation, DelayedCochlear ImplantationPregnancy, AnimalGestational AgeUterusResearch Support as TopicFetal ResearchResearch DesignLens Implantation, IntraocularEthics, ResearchResearch PersonnelCivil RightsNontherapeutic Human ExperimentationTherapeutic Human ExperimentationTrophoblastsNursing ResearchAbortion, InducedPregnant WomenTreatment OutcomeBrain Tissue TransplantationFetal ResorptionPacemaker, ArtificialEmbryonic and Fetal DevelopmentTime FactorsAmniotic FluidStentsExtraembryonic MembranesProsthesis DesignEndometriumTissue DistributionHealth Services ResearchTranslational Medical ResearchFetal DiseasesSocial Control, FormalHydrops FetalisEthics, MedicalLiverFetal DeathFetal WeightGenetic ResearchEmbryo TransferAdvisory CommitteesMoral ObligationsProstheses and ImplantsEmbryo, MammalianAortic Valve StenosisChorionic VilliRNA, MessengerFetal DevelopmentAbortion, LegalFollow-Up StudiesDrug-Eluting StentsDefibrillators, ImplantablePlacenta DiseasesInformed ConsentImmunohistochemistryLenses, IntraocularElectrodes, ImplantedCardiac CatheterizationFederal GovernmentYolk SacSheepPregnancy Trimester, FirstDeciduaBioprosthesisClinical Nursing ResearchPenile ImplantationCoronary RestenosisFetal ViabilityHeart-Assist DevicesFertilization in VitroMolecular Sequence DataDrug ImplantsAortic ValveRetrospective StudiesGene Expression Regulation, DevelopmentalProspective StudiesDental ResearchFetal BloodAbortion, SpontaneousSirolimusOrgan SpecificityBlood Vessel Prosthesis ImplantationBase SequenceCommunity-Based Participatory ResearchBrainBehavioral Research