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FetusGestational AgePregnancyFetal Tissue TransplantationComplicityAborted FetusRNA, MessengerDirected Tissue DonationPlacentaMaternal-Fetal ExchangeLifePersonhoodAbortion, VeterinaryBeginning of Human LifeResearchFetal ResearchTissue DistributionCivil RightsPregnancy, AnimalPregnant WomenAbortion, InducedTherapeutic Human ExperimentationNontherapeutic Human ExperimentationAmniotic FluidBrain Tissue TransplantationLiverMolecular Sequence DataOrgan SpecificityExtraembryonic MembranesFetal DiseasesFetal ResorptionHydrops FetalisAccess to InformationSocial Control, FormalBase SequenceEthics, MedicalResearch Support as TopicFetal WeightEmbryonic and Fetal DevelopmentFetal DeathAbortion, LegalMoral ObligationsAdvisory CommitteesResearch DesignAmino Acid SequenceEthics, ResearchChorionic VilliPlacenta DiseasesFetal DevelopmentResearch PersonnelFederal GovernmentDNA, ComplementaryUterusTrophoblastsYolk SacTissue KallikreinsImmunohistochemistryCloning, MolecularNursing ResearchBrainInformed ConsentKidneyFetal BloodPregnancy Trimester, FirstPregnancy Complications, InfectiousPolymerase Chain ReactionHealth Services ResearchSheepGene ExpressionFetal ViabilityBlotting, NorthernGenomic ImprintingMoralsEmbryo, MammalianTranslational Medical ResearchCell LinePrenatal DiagnosisAntibodies, MonoclonalLungAntigens, NeoplasmGene Expression Regulation, DevelopmentalTissue and Organ ProcurementReverse Transcriptase Polymerase Chain ReactionAmnionGovernment RegulationHealth Services AccessibilityDigestive SystemSequence Homology, Amino AcidGenetic ResearchCells, CulturedTissue BanksDNA ProbesExonsImmunoenzyme TechniquesTime FactorsDNAProteinsResource AllocationCattleUnited States