“…NPCs can self-renew and differentiate into neurons and glial cells (Morshead et al., 1994) as well as form neurospheres in the presence of epidermal growth factor (EGF) and basic fibroblast growth factor (bFGF) (Morshead et al., 1994, Reynolds and Weiss, 1992). NPCs transplanted into SCI survive (Akesson et al., 2007, Boido et al., 2011, Cummings et al., 2006, Jin et al., 2016, Karimi-Abdolrezaee et al., 2006, Macias et al., 2006, Nishimura et al., 2013, Okada et al., 2005, Pallini et al., 2005, Parr et al., 2007, Pfeifer et al., 2004, Pfeifer et al., 2006, Piltti et al., 2013, Salazar et al., 2010, Sandhu et al., 2017, Vroemen et al., 2003), migrate (Karimi-Abdolrezaee et al., 2006, Mligiliche et al., 2005, Nishimura et al., 2013, Pallini et al., 2005, Salazar et al., 2010), integrate (Boido et al., 2011, Salazar et al., 2010, Vroemen et al., 2003), and form functional synapses with neurons and act as neuronal relays (Ben-Hur, 2010, Bonner et al., 2011, Cummings et al., 2005, Hong et al., 2014, Karimi-Abdolrezaee et al., 2006, Lu et al., 2012).…”