Cord Blood Stem Cell TransplantationFetal BloodUmbilical CordBlood BanksSpinal CordUmbilical VeinsInfant, NewbornAntigens, CD34Transplantation, HomologousUmbilical ArteriesHematopoietic Stem CellsSpinal Cord InjuriesPregnancyHematopoietic Stem Cell TransplantationGraft vs Host DiseaseTransplantation ConditioningCells, CulturedMaternal-Fetal ExchangeHistocompatibility TestingHematologic NeoplasmsCell DifferentiationCell SeparationBlood PreservationMesenchymal Stromal CellsCell Culture TechniquesAntigens, CDGraft SurvivalBone Marrow TransplantationImmunophenotypingTransplantation ChimeraFlow CytometryMice, SCIDColony-Forming Units AssayStem CellsHernia, UmbilicalMice, Inbred NODAntigens, CD38PlacentaGestational AgeBone Marrow CellsNuchal CordTissue DonorsLeukemiaUnrelated DonorsDonor SelectionUrachal CystADP-ribosyl CyclaseBlood Cell CountStem Cell TransplantationFetusBlood CellsMyeloablative AgonistsT-LymphocytesCell LineageHematopoiesisTime FactorsLeukocytes, MononuclearCoculture TechniquesHLA AntigensBlood Transfusion, AutologousHematologic DiseasesFetal Stem CellsBlood DonorsMaternal ExposureNAD+ NucleosidaseHistocompatibilityWharton JellyCryopreservationAmniotic FluidTreatment OutcomeGraft vs Leukemia EffectStem Cell FactorAntigens, CD45Endothelial CellsAllograftsTransplantation, HeterologousCell ProliferationHuman Umbilical Vein Endothelial CellsAnemia, AplasticInfant, PostmatureSpinal Cord Diseases