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In vertebrates, a neuroblast or primitive nerve cell[1] is a postmitotic cell that does not divide further,[2] and which will develop into a neuron after a migration phase.[3] In invertebrates such as Drosophila, neuroblasts are neural progenitor cells which divide asymmetrically to produce a neuroblast, and a daughter cell of varying potency depending on the type of neuroblast. Vertebrate neuroblasts differentiate from radial glial cells and are committed to becoming neurons.[4] Neural stem cells, which only divide symmetrically to produce more neural stem cells, transition gradually into radial glial cells.[5] Radial glial cells, also called radial glial progenitor cells, divide asymmetrically to produce a neuroblast and another radial glial cell that will re-enter the cell cycle.[5][3]