Blood DonorsTissue DonorsFetal BloodUmbilical CordRegistriesHistocompatibility TestingCord Blood Stem Cell TransplantationTissue and Organ ProcurementHLA AntigensHematopoietic Stem Cell TransplantationHematopoietic Stem CellsBlood BanksUmbilical VeinsDonor SelectionAntigens, CD34Umbilical ArteriesTransplantation, HomologousInfant, NewbornPregnancyVolunteersCells, CulturedSpinal CordLiving DonorsHematopoietic Stem Cell MobilizationGraft vs Host DiseaseCell DifferentiationTransplantation ConditioningHematopoiesisGranulocyte Colony-Stimulating FactorBone Marrow CellsHematologic NeoplasmsColony-Forming Units AssayLymphocytesSpinal Cord InjuriesMaternal-Fetal ExchangeT-LymphocytesCell SeparationFlow CytometryTime FactorsGraft SurvivalAntigens, CDMesenchymal Stromal CellsCell Culture TechniquesBlood PreservationHernia, UmbilicalMice, SCIDStem CellsCell LineageHealthy VolunteersBlood CellsImmunophenotypingLeukemiaAntigens, CD38Mice, Inbred NODUnrelated DonorsSpleenGestational AgeUrachal CystADP-ribosyl CyclaseHematopoietic SystemPlacentaTreatment OutcomeFetusTransplantation ChimeraMyeloablative AgonistsBlood Cell CountNuchal CordStem Cell FactorLeukocytes, MononuclearCoculture TechniquesNAD+ NucleosidaseCell DivisionInterleukin-3Fetal Stem CellsWharton JellyEndothelial CellsAntigens, CD45Hematopoietic Cell Growth FactorsBone Marrow TransplantationHistocompatibilityCell ProliferationHematologic DiseasesBone MarrowCryopreservationRetrospective StudiesHuman Umbilical Vein Endothelial CellsErythroid Precursor CellsTransplantation, HeterologousUltrasonography, PrenatalWhole-Body IrradiationCell LineUmbilicusAmniotic FluidChimerismEndothelium, VascularProspective StudiesInfant, PostmatureRetroviridaeStem Cell TransplantationAnemia, Aplastic