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FetusChimerismFetomaternal TransfusionMaternal-Fetal ExchangeFetal ResearchPregnancyFetal Tissue TransplantationFetal Stem CellsComplicityAborted FetusPrenatal DiagnosisResearchPlacentaDirected Tissue DonationLifeGestational AgeErythroblastsPersonhoodAmniotic FluidFetal BloodBeginning of Human LifeAbortion, VeterinaryTrophoblastsChimeraIn Situ Hybridization, FluorescenceSex Determination AnalysisY ChromosomePregnancy Trimester, FirstResearch Support as TopicLiverPolymerase Chain ReactionResearch DesignChromosomes, Human, YCloning, OrganismEthics, ResearchTissue and Organ ProcurementFetal HemoglobinResearch PersonnelPregnancy, AnimalCivil RightsCells, CulturedNontherapeutic Human ExperimentationTherapeutic Human ExperimentationGenes, sryNursing ResearchPregnant WomenAbortion, InducedOrgan SpecificityTissue DistributionGreen Fluorescent ProteinsBrain Tissue TransplantationCell SeparationOrgan TransplantationDNACell DifferentiationExtraembryonic MembranesRNA, MessengerHealth Services ResearchTranslational Medical ResearchFetal DiseasesBlood CellsRh-Hr Blood-Group SystemImmunohistochemistryFetal ResorptionSocial Control, FormalHydrops FetalisEthics, MedicalStem CellsLungEmbryonic and Fetal DevelopmentGenetic ResearchMoral ObligationsFetal WeightAdvisory CommitteesKaryotypingPregnancy ComplicationsMice, Inbred C57BLFetal DeathAneuploidyAbortion, LegalInformed ConsentFibroblastsFetal DevelopmentChorionic VilliErythroid Precursor CellsPlacenta DiseasesFederal GovernmentMolecular Sequence DataScleroderma, SystemicClinical Nursing ResearchYolk SacMultiple Organ FailureBlood Cell CountUterusFlow CytometryMice, TransgenicKidneyOrgan SizeBase SequenceDental Research