Fetal BloodUmbilical CordCord Blood Stem Cell TransplantationRegistriesTissue DonorsHematopoietic Stem CellsHematopoietic Stem Cell TransplantationBlood BanksUmbilical VeinsDonor SelectionAntigens, CD34Umbilical ArteriesTransplantation, HomologousInfant, NewbornHistocompatibility TestingPregnancyCells, CulturedSpinal CordHematopoietic Stem Cell MobilizationBlood DonorsGraft vs Host DiseaseCell DifferentiationHematopoiesisTransplantation ConditioningGranulocyte Colony-Stimulating FactorBone Marrow CellsColony-Forming Units AssaySpinal Cord InjuriesMaternal-Fetal ExchangeHematologic NeoplasmsLymphocytesT-LymphocytesCell SeparationFlow CytometryMesenchymal Stromal CellsAntigens, CDCell Culture TechniquesHernia, UmbilicalBlood PreservationVolunteersMice, SCIDStem CellsTime FactorsCell LineageGraft SurvivalBlood CellsAntigens, CD38ImmunophenotypingUnrelated DonorsMice, Inbred NODLeukemiaLiving DonorsGestational AgeSpleenUrachal CystADP-ribosyl CyclaseHematopoietic SystemPlacentaTransplantation ChimeraMyeloablative AgonistsFetusNuchal CordStem Cell FactorBlood Cell CountTreatment OutcomeNAD+ NucleosidaseCoculture TechniquesLeukocytes, MononuclearInterleukin-3Cell DivisionWharton JellyHLA AntigensFetal Stem CellsEndothelial CellsHematopoietic Cell Growth FactorsAntigens, CD45Human Umbilical Vein Endothelial CellsHematologic DiseasesCell ProliferationErythroid Precursor CellsBone MarrowCryopreservationUltrasonography, PrenatalUmbilicusTransplantation, HeterologousAmniotic FluidInfant, PostmatureWhole-Body IrradiationCell LineRetrospective StudiesHistocompatibilityRetroviridaeEndothelium, VascularChimerismMaternal ExposureBone Marrow TransplantationStem Cell TransplantationAnemia, AplasticStromal CellsTransduction, Genetic