 Additionally, the existence of microglia and endothelial cells within the SVZ was found to enhance neurogenesis, as well as providing for some directional migration of neuroblasts from the SVZ.Recently, the human SVZ has been characterized in brain tumor patients at phenotypic and genetic level.These data reveal that in half of the patients the SVZ is an exact site of tumorigenesis whereas in the remaining patients it represents an infiltrated region.