Cord Blood Stem Cell TransplantationFetal BloodTransplantation, HomologousSpinal CordDisease Models, AnimalSpinal Cord InjuriesMice, Inbred C57BLMice, Inbred BALB CHematopoietic Stem Cell TransplantationGraft vs Host DiseaseBone Marrow TransplantationSignal TransductionUmbilical CordCells, CulturedAnti-Inflammatory AgentsTime FactorsTransplantation ConditioningTreatment OutcomeBlood BanksCell Line, TumorRats, Sprague-DawleyCytokinesAntibodies, MonoclonalInfant, NewbornCell ProliferationAntigens, CD34Hematologic Neoplasms