Cord Blood Stem Cell TransplantationFetal BloodSpinal CordTissue DonorsSpinal Cord InjuriesBlood DonorsLiving DonorsUmbilical CordBlood BanksInfant, NewbornAntigens, CD34Hematopoietic Stem CellsPregnancyMaternal-Fetal ExchangeHematopoietic Stem Cell TransplantationHistocompatibility TestingSpinal Cord DiseasesGraft SurvivalTransplantation, HomologousSpinal Cord CompressionCells, CulturedGraft vs Host DiseaseSpermatic CordCell DifferentiationSpinal Cord IschemiaSpinal Cord NeoplasmsMice, SCIDCell SeparationFlow CytometryImmunophenotypingBlood PreservationTransplantation ConditioningColony-Forming Units AssayCell Culture TechniquesMice, Inbred NODAntigens, CDTime Factors