Fetal BloodCord Blood Stem Cell TransplantationUmbilical CordAntigens, CD34Hematopoietic Stem CellsMice, Inbred NODMice, SCIDCell Culture TechniquesCell DifferentiationCells, CulturedGraft SurvivalBlood BanksHematopoietic Stem Cell TransplantationUmbilical VeinsInfant, NewbornUmbilical ArteriesBlood CellsPregnancyGraft vs Host DiseaseStem Cell TransplantationSpinal CordStem CellsTransplantation, HeterologousTransplantation, HomologousColony-Forming Units AssayADP-ribosyl CyclaseCell SeparationAntigens, CD38HematopoiesisAntigens, CDFlow CytometryCell LineageStem Cell FactorNAD+ NucleosidaseImmunophenotypingMaternal-Fetal ExchangeSpinal Cord InjuriesBone Marrow CellsBlood PreservationBlood Cell CountTime FactorsMesenchymal Stromal CellsHernia, UmbilicalMesenchymal Stem Cell TransplantationHistocompatibility TestingErythroid Precursor CellsLeukocytes, MononuclearCoculture TechniquesTransplantation ConditioningAntigens, CD45Graft Occlusion, VascularIslets of Langerhans TransplantationUrachal CystHematopoietic Cell Growth FactorsFetal Tissue TransplantationGestational AgeThrombopoietinCulture Media, Serum-FreePlacentaErythrocytesHematologic NeoplasmsNuchal CordAntigens, DifferentiationBone Marrow TransplantationCell DivisionCell SurvivalFetusDonor SelectionUnrelated DonorsCell ProliferationRetroviridaeWharton JellyDisease Models, AnimalTransplantation ChimeraInterleukin-3Human Umbilical Vein Endothelial CellsT-LymphocytesCryopreservationFetal Stem CellsEndothelial CellsTreatment OutcomeTransduction, GeneticUltrasonography, PrenatalAmniotic FluidUmbilicusMyeloablative AgonistsTransplantsRats, Inbred F344Blood DonorsCytokinesInfant, PostmatureHematologic DiseasesLeukemiaHLA AntigensEndothelium, VascularMembrane GlycoproteinsBlood Transfusion, AutologousMaternal ExposureGenetic VectorsLeukocyte Count