Umbilical CordStem CellsAdult Stem CellsNeoplastic Stem CellsCell DifferentiationCell LineageSpinal CordCell ProliferationFetal BloodSpinal Cord InjuriesUmbilical VeinsUmbilical ArteriesCord Blood Stem Cell TransplantationHematopoietic Stem CellsStem Cell TransplantationEmbryonic Stem CellsHematopoietic Stem Cell TransplantationMaternal-Fetal ExchangeMethylmercury CompoundsPregnancyPluripotent Stem CellsMesenchymal Stromal CellsCells, Cultured