BDNF and deafness: Neurotrophins (NTs), in particular neutrophin-3 (NT3) and brain derived neurotrophic factor (BDNF), have been shown to play key roles in both the development and survival of SGNs [11], [12], [13], [14], [15], [16], and as such have been the focus of research aiming to mitigate degeneration of SGNs after deafness.