FetusFetal BloodGestational AgePregnancyThymus GlandCordocentesisMaternal-Fetal ExchangeRNA, MessengerFetal Tissue TransplantationPlacentaComplicityAborted FetusFetal DiseasesBlood Transfusion, IntrauterineAmniotic FluidFetomaternal TransfusionDirected Tissue DonationHydrops FetalisRh IsoimmunizationErythroblastosis, FetalPregnancy, AnimalPrenatal DiagnosisLifeSheepFetoscopyHeart Rate, FetalPersonhoodAbortion, VeterinaryBeginning of Human LifeFetal WeightFetal HypoxiaFetal DeathFetal Growth RetardationUmbilical ArteriesBlood Specimen CollectionUmbilical CordThymus NeoplasmsEmbryonic and Fetal DevelopmentPregnancy Trimester, SecondThymus HyperplasiaFetal ResearchPlacental CirculationChorionic VilliFetal DevelopmentPregnancy Trimester, ThirdUltrasonography, PrenatalCardiotocographyCivil RightsThymus PlantUterusPregnancy Trimester, FirstLiverFetal Stem CellsVitamin K Deficiency BleedingInfant, NewbornPregnant WomenBlood Gas AnalysisTrophoblastsAbortion, InducedLabor, ObstetricThymus ExtractsBrain Tissue TransplantationTissue DistributionTherapeutic Human ExperimentationThymus HormonesFetal HemoglobinExtraembryonic MembranesHemoglobinopathiesNontherapeutic Human ExperimentationErythema InfectiosumFetal ResorptionT-LymphocytesUltrasonography, DopplerFetal HeartSocial Control, FormalAmniocentesisThymectomyAcidosisMice, Inbred C57BLAnesthesia, ObstetricalFetofetal TransfusionSpleenAbortion, LegalUmbilical VeinsOrgan SpecificityEthics, MedicalErythrocyte CountBlood Flow VelocityPlacenta DiseasesMoral ObligationsMolecular Sequence DataHematopoietic Stem CellsErythroblastsYolk SacAdvisory CommitteesBase SequenceCattleHematocritCell DifferentiationPulsatile Flow