NTRK2 and amyotrophic lateral sclerosis: If any, the p75NTR protein fragments expressed by p75NTR exon III null mice could play a beneficial effect in the context of the NMJ, as they have been shown to increase BDNF-TrkB dependent survival of motor neurons in vitro and in vivo in the hSODG93A mice model of amyotrophic lateral sclerosis [56].