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FetusGestational AgePregnancyFetal Tissue TransplantationComplicityAborted FetusRNA, MessengerDirected Tissue DonationMaternal-Fetal ExchangePlacentaLifePersonhoodAbortion, VeterinaryBeginning of Human LifeResearchFetal ResearchCivil RightsPregnancy, AnimalPregnant WomenAbortion, InducedTherapeutic Human ExperimentationNontherapeutic Human ExperimentationAmniotic FluidBrain Tissue TransplantationExtraembryonic MembranesFetal DiseasesTissue DistributionFetal ResorptionHydrops FetalisLiverAccess to InformationSocial Control, FormalEthics, MedicalResearch Support as TopicFetal WeightEmbryonic and Fetal DevelopmentFetal DeathResearch DesignAbortion, LegalMolecular Sequence DataMoral ObligationsAdvisory CommitteesEthics, ResearchChorionic VilliPlacenta DiseasesFetal DevelopmentResearch PersonnelFederal GovernmentYolk SacBase SequenceTrophoblastsUterusModels, BiologicalNursing ResearchFetal BloodPregnancy Trimester, FirstOrgan SpecificityPregnancy Complications, InfectiousSheepInformed ConsentHealth Services ResearchFetal ViabilityBrainAmino Acid SequenceMoralsTranslational Medical ResearchImmunohistochemistryGenomic ImprintingPrenatal DiagnosisGene Expression Regulation, DevelopmentalEmbryo, MammalianGovernment RegulationTime FactorsKidneyHealth Services AccessibilityGenetic ResearchAmnionProteinsPolymerase Chain ReactionTissue and Organ ProcurementUnited StatesGene ExpressionCells, CulturedAntigens, NeoplasmCell LineResource AllocationCattleAntibodies, MonoclonalDNA, ComplementaryCloning, MolecularMaternal ExposureLungBiological ProductsDNA ProbesAbortion, SpontaneousPersonal AutonomyTrisomyGene Expression ProfilingBlotting, NorthernCell Differentiation