FetusFetal BloodGestational AgePregnancyLymphocytesCordocentesisMaternal-Fetal ExchangeRNA, MessengerFetal Tissue TransplantationPlacentaComplicityLymphocyte ActivationAborted FetusFetal DiseasesBlood Transfusion, IntrauterineAmniotic FluidFetomaternal TransfusionDirected Tissue DonationHydrops FetalisRh IsoimmunizationErythroblastosis, FetalPregnancy, AnimalPrenatal DiagnosisLifeSheepT-LymphocytesFetoscopyHeart Rate, FetalPersonhoodLymphocyte SubsetsAbortion, VeterinaryBeginning of Human LifeFetal WeightFetal HypoxiaFetal DeathLymphocyte CountBlood Specimen CollectionFetal Growth RetardationUmbilical ArteriesUmbilical CordB-LymphocytesPregnancy Trimester, SecondFetal ResearchEmbryonic and Fetal DevelopmentPlacental CirculationChorionic VilliFetal DevelopmentPregnancy Trimester, ThirdCardiotocographyUltrasonography, PrenatalCivil RightsUterusPregnancy Trimester, FirstThymus GlandCells, CulturedLymphocyte Culture Test, MixedLiverSpleenFetal Stem CellsInfant, NewbornVitamin K Deficiency BleedingTrophoblastsPregnant WomenBlood Gas AnalysisAbortion, InducedLymphocytes, Tumor-InfiltratingMice, Inbred C57BLLabor, ObstetricPhytohemagglutininsBrain Tissue TransplantationTherapeutic Human ExperimentationT-Lymphocytes, CytotoxicAntibodies, MonoclonalFetal HemoglobinExtraembryonic MembranesLymphocyte TransfusionHemoglobinopathiesMolecular Sequence DataNontherapeutic Human ExperimentationErythema InfectiosumTissue DistributionCD4-Positive T-LymphocytesFetal ResorptionConcanavalin ALeukocyte CountCytotoxicity, ImmunologicUltrasonography, DopplerFlow CytometryFetal HeartSocial Control, FormalAmniocentesisBase SequenceUmbilical VeinsAcidosisInterleukin-2Mice, Inbred BALB CAntigens, SurfaceErythrocyte CountAnesthesia, ObstetricalCell Line