Hematopoietic Stem CellsFetal BloodUmbilical CordAntigens, CD34Cord Blood Stem Cell TransplantationColony-Forming Units AssayHematopoietic Stem Cell TransplantationHematopoiesisRegistriesCell DifferentiationCells, CulturedTissue DonorsStem CellsBlood BanksUmbilical VeinsDonor SelectionUmbilical ArteriesTransplantation, HomologousInfant, NewbornHistocompatibility TestingBone Marrow CellsHematopoietic Stem Cell MobilizationPregnancyCell LineageSpinal CordGranulocyte Colony-Stimulating FactorFlow CytometryCell SeparationAntigens, CDBlood DonorsMesenchymal Stromal CellsGraft vs Host DiseaseCell Culture TechniquesMyeloid Progenitor CellsCell ProliferationTransplantation ConditioningEndothelial CellsMice, SCIDT-LymphocytesTime FactorsStem Cell FactorErythroid Precursor CellsBlood CellsHematologic NeoplasmsSpinal Cord InjuriesLymphocytesBone MarrowMaternal-Fetal ExchangeStem Cell TransplantationCell DivisionImmunophenotypingGraft SurvivalAntigens, CD38Interleukin-3Mice, Inbred NODBlood PreservationFetal Stem CellsBlood Cell CountHematopoietic SystemLeukemiaHernia, UmbilicalSpleenADP-ribosyl CyclaseFetusVolunteersMice, Inbred C57BLHematopoietic Cell Growth FactorsCoculture TechniquesCell CountMultipotent Stem CellsGestational AgeTransplantation ChimeraUnrelated DonorsLiving DonorsNeural Stem CellsPlacentaUrachal CystGranulocytesAntigens, CD45Bone Marrow TransplantationSignal TransductionNAD+ NucleosidaseMegakaryocytesCell MovementGranulocyte-Macrophage Progenitor CellsCell LineTreatment OutcomeCell SurvivalMyeloablative AgonistsLeukocytes, MononuclearStromal CellsBiological MarkersRetroviridaeEndothelium, VascularProto-Oncogene Proteins c-kitNuchal CordNeovascularization, PhysiologicRNA, MessengerThrombopoietin