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Maternal-Fetal ExchangePregnancyFetal BloodPlacentaFetomaternal TransfusionBlood CellsFetusPrenatal DiagnosisTrophoblastsErythroblastsErythrocytesAmniotic FluidCordocentesisPlacentationGestational AgePregnancy Trimester, FirstPre-EclampsiaPlacental CirculationInfant, NewbornLeadPregnancy Trimester, ThirdChorionic VilliPregnancy, AnimalErythrocyte CountPlacenta DiseasesMaternal ExposureLabor, ObstetricPhenylketonuria, MaternalFetal DiseasesUterusSex Determination AnalysisPregnancy Trimester, SecondMilk, HumanBlood Cell CountFetal HemoglobinErythroblastosis, FetalPregnancy ProteinsPlacental LactogenAnesthesia, ObstetricalHypertension, Pregnancy-InducedHeart Rate, FetalPostpartum PeriodBirth WeightPregnancy ComplicationsUmbilical CordUmbilical ArteriesFetal DevelopmentCell SeparationBlood Chemical AnalysisFetal Growth RetardationParturitionAneuploidyEnvironmental PollutantsPregnancy in DiabeticsDown SyndromeTrisomyErythrocyte TransfusionSheepReceptors, TransferrinChromosomes, Human, Pair 21Ultrasonography, Doppler, PulsedPregnancy Complications, InfectiousIn Situ Hybridization, FluorescenceErythrocyte MembraneUterine ArteryPregnancy Complications, ParasiticErythrocyte DeformabilityPrenatal Exposure Delayed EffectsMethylmercury CompoundsY ChromosomeExtraembryonic MembranesLeukocyte CountPregnancy TrimestersPregnancy Complications, CardiovascularChromosomes, Human, Pair 18MothersEnvironmental ExposureDNABiological MarkersPolymerase Chain ReactionCesarean SectionInfectious Disease Transmission, VerticalUltrasonography, PrenatalCytogenetic AnalysisGlobinsChorionic Gonadotropin, beta Subunit, HumanDelivery, ObstetricLeukocytesLactationProspective StudiesBloodObstetric Labor, PrematureTime FactorsBlood PressureErythrocyte AggregationHemoglobinsOxygenEmbryo ImplantationErythrocyte AgingPregnancy Outcome