Cord Blood Stem Cell TransplantationFetal BloodUmbilical CordTransplantation, HomologousBlood BanksSpinal CordHematopoietic Stem Cell TransplantationGraft vs Host DiseaseUmbilical VeinsAntigens, CD34Infant, NewbornUmbilical ArteriesHematopoietic Stem CellsPregnancySpinal Cord InjuriesTransplantation ConditioningBone Marrow TransplantationHematologic NeoplasmsCells, CulturedHistocompatibility TestingMaternal-Fetal ExchangeTransplantation ChimeraGraft SurvivalCell DifferentiationCell SeparationAntigens, CDFlow CytometryImmunophenotypingBlood PreservationMesenchymal Stromal CellsTissue DonorsT-LymphocytesLeukemiaCell Culture TechniquesMice, SCIDStem Cell TransplantationColony-Forming Units AssayStem CellsBone Marrow CellsMyeloablative AgonistsMice, Inbred NODHernia, UmbilicalHistocompatibilityGraft vs Leukemia EffectPlacentaAntigens, CD38Time FactorsLymphocyte Culture Test, MixedHLA AntigensGestational AgeUnrelated DonorsIsoantigensBlood CellsDonor SelectionBlood Transfusion, AutologousWhole-Body IrradiationNuchal CordBlood Cell CountHematopoiesisTreatment OutcomeFetusCoculture TechniquesADP-ribosyl CyclaseHematologic DiseasesUrachal CystLymphocyte ActivationLeukocytes, MononuclearCell LineageAnemia, AplasticBlood DonorsBusulfanAllograftsChimerismVidarabineGraft vs Tumor EffectTransplantation, AutologousLymphocytesRecurrenceBlood TransfusionFetal Stem CellsCytotoxicity, ImmunologicCryopreservationMaternal ExposureAntigens, CD45NAD+ NucleosidaseCell ProliferationKiller Cells, NaturalWharton JellyTransplantation, HeterologousAmniotic FluidLeukemia, Myeloid, AcuteStem Cell FactorEndothelial CellsTransplantation, IsogeneicSiblingsCytokinesImmunosuppressive AgentsPrecursor Cell Lymphoblastic Leukemia-LymphomaHuman Umbilical Vein Endothelial CellsRetrospective Studies