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FetusMaternal-Fetal ExchangePregnancyPlacentaFetal Tissue TransplantationGestational AgeFetal HypoxiaComplicityAborted FetusResearchFetal DiseasesDirected Tissue DonationAutopsyOrgan SizeEmbryonic and Fetal DevelopmentLiverFetal Organ MaturityLifePersonhoodLungBeginning of Human LifeAbortion, VeterinaryBrainSheepResearch Support as TopicFetal ResearchResearch DesignEthics, ResearchTissue and Organ ProcurementResearch PersonnelPregnancy, AnimalCivil RightsNontherapeutic Human ExperimentationTherapeutic Human ExperimentationNursing ResearchPregnant WomenAbortion, InducedOrgan SpecificityAmniotic FluidTissue DistributionBrain Tissue TransplantationOrgan TransplantationExtraembryonic MembranesHealth Services ResearchTranslational Medical ResearchFetal ResorptionSocial Control, FormalHydrops FetalisEthics, MedicalGenetic ResearchMoral ObligationsFetal WeightAdvisory CommitteesFetal DeathAbortion, LegalInformed ConsentFetal DevelopmentChorionic VilliPlacenta DiseasesFederal GovernmentMolecular Sequence DataRNA, MessengerClinical Nursing ResearchYolk SacMultiple Organ FailureUterusTrophoblastsKidneyBase SequenceDental ResearchFetal BloodMoralsGene Expression Regulation, DevelopmentalPregnancy Trimester, FirstOrgan of CortiCommunity-Based Participatory ResearchBehavioral ResearchPregnancy Complications, InfectiousQualitative ResearchImmunohistochemistryFetal ViabilityGovernment RegulationEmbryo, MammalianTime FactorsUnited StatesHuman ExperimentationGenomic ImprintingPrenatal DiagnosisPolymerase Chain ReactionAmnionAmino Acid SequencePersonal AutonomyDigestive SystemCell DifferentiationGene ExpressionDNA, ComplementaryDisease Models, AnimalMaternal ExposureIn Situ HybridizationResource Allocation