RTN4 and amyotrophic lateral sclerosis: Further molecular characteristics of pathology at the NMJ in ALS patients include a change in AChR subunit expression (Palma et al., 2016), increased Nogo‐A expression (Bruneteau et al., 2015) and changes in pre‐synaptic voltage‐gated calcium channel subunit expression (Day et al., 1997).