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FetusFetal Tissue TransplantationMaternal-Fetal ExchangeComplicityPregnancyPlacentaAborted FetusResearchGestational AgeDirected Tissue DonationLifeFetal HypoxiaPersonhoodFetal DiseasesBeginning of Human LifeAbortion, VeterinaryLiverEmbryonic and Fetal DevelopmentAutopsyResearch Support as TopicFetal ResearchOrgan SizeResearch DesignEthics, ResearchFetal Organ MaturityResearch PersonnelLungCivil RightsPregnancy, AnimalSheepBrainNontherapeutic Human ExperimentationTherapeutic Human ExperimentationNursing ResearchPregnant WomenAbortion, InducedAmniotic FluidBrain Tissue TransplantationExtraembryonic MembranesTissue DistributionHealth Services ResearchTranslational Medical ResearchFetal ResorptionTissue and Organ ProcurementSocial Control, FormalHydrops FetalisEthics, MedicalGenetic ResearchMoral ObligationsOrgan SpecificityFetal WeightAdvisory CommitteesFetal DeathAbortion, LegalInformed ConsentChorionic VilliFetal DevelopmentPlacenta DiseasesFederal GovernmentClinical Nursing ResearchYolk SacRNA, MessengerMolecular Sequence DataUterusTrophoblastsDental ResearchFetal BloodPregnancy Trimester, FirstCommunity-Based Participatory ResearchMoralsBehavioral ResearchPregnancy Complications, InfectiousBase SequenceQualitative ResearchFetal ViabilityKidneyGene Expression Regulation, DevelopmentalOrgan TransplantationGovernment RegulationImmunohistochemistryUnited StatesHuman ExperimentationGenomic ImprintingEmbryo, MammalianPrenatal DiagnosisAmnionTime FactorsPolymerase Chain ReactionPersonal AutonomyAmino Acid SequenceMaternal ExposureAcademies and InstitutesAntigens, NeoplasmResource AllocationAbortion, SpontaneousGene ExpressionDNA, ComplementaryDigestive SystemTrisomyEmpirical Research