PROM1 and glioblastoma: Moreover, the human choroid plexus ependymal cells are potential NSCs because they are embedded in a potentially neurogenic microenvironment surrounding the choroidal fissure [59] and express CD133 in the same way as embryonic NSCs [60] and glioblastoma stem cells [61]; in addition, rat choroid plexus ependymal cells display NSC features [62].