PlacentaPlacenta DiseasesPlacenta PreviaPlacenta AccretaPlacenta, RetainedPregnancyTrophoblastsMaternal-Fetal ExchangeChorionic VilliDeuterium Exchange MeasurementPulmonary Gas ExchangePlacentationPregnancy ProteinsExchange Transfusion, Whole BloodSister Chromatid ExchangeFetusPre-EclampsiaGestational AgeMolecular Sequence DataExtraembryonic MembranesChorionKineticsPregnancy Trimester, ThirdPregnancy, AnimalHydrogenAmino Acid SequenceChromatography, Ion ExchangePregnancy Trimester, FirstPlacental LactogenPlacental CirculationSodium-Hydrogen AntiporterDeciduaHydrogen-Ion ConcentrationChoriocarcinomaFetal Growth RetardationSodiumUterusRho Guanine Nucleotide Exchange FactorsBase SequenceDeuteriumFetal DevelopmentIon Exchange ResinsPlacental HormonesSodium-Calcium ExchangerAbortion, VeterinaryCarrier ProteinsAmnionBiological TransportAmilorideCesarean SectionImmunohistochemistryLabor, ObstetricPregnancy Trimester, SecondAmniotic FluidAnion Exchange ResinsPregnancy Complications, ParasiticProtein BindingYolk SacPregnancy ComplicationsUmbilical CordHydatidiform MoleCattleMagnetic Resonance SpectroscopyCloning, MolecularGenomic ImprintingFetal DeathChorioamnionitisGuanosine DiphosphateAntiportersTissue DistributionBicarbonatesPlacental ExtractsCells, CulturedModels, BiologicalAllantoisFetal BloodGene ExpressionTime FactorsCalciumInfant, NewbornCell LineProtonsChloride-Bicarbonate AntiportersPregnancy Complications, InfectiousSequence Homology, Amino AcidAborted FetusDNAProteinsModels, MolecularBinding SitesProtein ConformationProtein Structure, TertiarySheepDNA, ComplementaryMolecular WeightElectrophoresis, Polyacrylamide GelCation Exchange ResinsChloridesOxygenCarbon Dioxide