Cord Blood Stem Cell TransplantationFetal BloodBone MarrowBone Marrow CellsUmbilical CordBone Marrow TransplantationHematopoietic Stem Cell TransplantationGraft vs Host DiseaseTransplantation ChimeraTransplantation, HomologousHematologic NeoplasmsHistocompatibility TestingTransplantation ConditioningTissue DonorsHematopoietic Stem CellsBone and BonesBlood BanksAntigens, CD34Treatment OutcomeBone Marrow DiseasesUmbilical VeinsBone Marrow ExaminationBone Marrow NeoplasmsUmbilical ArteriesColony-Forming Units AssayCell DifferentiationCells, CulturedInfant, NewbornHematopoiesisPregnancySpinal CordGraft SurvivalBone Marrow PurgingFlow CytometryBone RemodelingCell SeparationLeukemiaStem CellsAnemia, AplasticWhole-Body IrradiationTime FactorsImmunophenotypingTransplantation, AutologousAntigens, CDStromal CellsMice, Inbred C57BLMesenchymal Stromal CellsCell LineageBlood Cell CountBone DensityCell Culture Techniques