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(Human) neural stem cellsAnother promising cell-based therapy for repair of the injured spinal cord involves (human) neural stem cells. These cells have the potential to provide cell-replacement for both neurons and glia.However, it has been -and still can be-a main problem that neural stem cells tend to mostly differentiate into astrocytes, which, in some cases, can support neuronal hyperexcitability (Hofstetter 2005, Martino 2006, Setoguchi 2004). Neuronal and oligodendroglia differentiation would certainly lead to better therapeutic effects of neural stem cell treatment (Abematsu 2010, Cummings 2005, Keirstead 2005). Neurons derived from neural stem cells are able to fully integrate into the host circuitry and their oligodendrocytes effectively remyelinate axons (Englund 2002, Keirstead 2005). Human fetal spinal cord derived neural stem cells (HSSC) grown in a monolayer, have shown to give rise to neurons, astrocytes, and oligodendrocytes in a rodent SCI model (Yan 2007). Furthermore, these HSSC were shown to be able to reduce spasticity (and improve locomotor function) after intraspinal grafting in a rodent SCI model of spasticity, which was attributed to their differentiation in inhibitory (γ-aminobutyric acid-ergic (GABA) and glycinergic neurons (Cizkova 2007). Lack of inhibition might be an important mechanism for neuronal hyperexcitability underlying pain and spasticity after SCI (Gwak 2011b). Furthermore, by impr...