* If divided horizontally, one cell stays stem cell, one becomes post-mitotic and begins moving. If divided vertically, both stay stem cell.
* Depends on the distribution of 2 TFs, notch-1 and numb
* Notch-1 accumulates on the pial side of the cell
* Numb accululates on the VZ side
* In vertical cleavage, both daughter cells contain both TFs, presence of numb dictates the fate of a cell as a neuroblast
* In horizontal cleavage, the top cell has notch-1, making it post-mitotic.