Neoplastic Stem CellsGlioblastomaSpheroids, CellularStem CellsBrain NeoplasmsStem Cell TransplantationHematopoietic Stem CellsEmbryonic Stem CellsAdult Stem CellsPluripotent Stem CellsHematopoietic Stem Cell TransplantationStem Cell NicheNeural Stem CellsCell DifferentiationInduced Pluripotent Stem CellsMesenchymal Stem Cell TransplantationMultipotent Stem CellsMesenchymal Stromal CellsCell ProliferationGliomaStem Cell FactorCell Line, Tumor