“…The incorporation of growth factors, such as brain-derived growth factor (BDNF), neurotrophin-3 (NT-3), neurotrophin-4/5 (NT-4/5), growth/differentiation factor 5 (GDF5) and GDNF, has been investigated for their potential to improve dopaminergic cell transplantation strategies (Clayton & Sullivan, 2007;Feng et al, 1999;Hyman et al, 1994;Jaumotte & Zigmond, 2014;Lin, Doherty, Lile, Bektesh, & Collins, 1993). While they have all shown to improve dopamine neuron survival in VM cultures, GDNF has been established as an extremely potent neurotrophic factor, significantly improving cell survival and efficacy (Apostolides, Sanford, Hong, & Mendez, 1998;Chaturvedi et al, 2003;Deng et al, 2013;Redmond et al, 2013;Rosenblad, Martinez-Serrano, & Bjorklund, 1996;Yurek, Flectcher, Kowalczyk, Padegimas, & Cooper, 2009).…”