Cord Blood Stem Cell TransplantationTransplantation, HomologousHematopoietic Stem Cell TransplantationFetal BloodGraft vs Host DiseaseTransplantation ConditioningSpinal CordHematologic NeoplasmsGraft vs Leukemia EffectSpinal Cord InjuriesGraft vs Tumor EffectLeukemiaTransplantation, AutologousBone Marrow TransplantationUmbilical CordTreatment OutcomeRetrospective StudiesBlood BanksRecurrenceInfant, NewbornAntigens, CD34Acute DiseaseTime FactorsTransplantation ChimeraHematopoietic Stem CellsHistocompatibility TestingGraft SurvivalT-LymphocytesSurvival RateTissue DonorsIsoantigensLymphocyte Culture Test, MixedPregnancyHistocompatibilityStem Cell TransplantationFollow-Up StudiesWhole-Body IrradiationProspective StudiesCells, CulturedRisk FactorsLymphocyte ActivationMaternal-Fetal ExchangeTransplantation, IsogeneicFlow CytometryMyeloablative AgonistsImmunophenotypingBusulfanAntigens, CDHLA AntigensCell DifferentiationCell SeparationSpinal Cord DiseasesTransplantation ImmunologySkin TransplantationBone Marrow CellsGraft vs Host ReactionCytotoxicity, ImmunologicLeukemia, Myeloid, AcuteChimerismMice, SCIDGraft RejectionSpinal Cord CompressionVidarabineImmunosuppressive AgentsPrecursor Cell Lymphoblastic Leukemia-LymphomaMice, Inbred C57BL