“…source of new neurons in the adult brain, and contains a subset of astrocytes which behave as stem cells both in vivo and in vitro [18,25,30,43,45,68], and derive from radial glia (RG) cells [17,39]. In fact, RG cells also act as NSCs and source of neurogenesis, and probably give rise to astrocytes in the cerebral cortex [17,23,64,74].…”