RAN and amyotrophic lateral sclerosis: Post‐mortem examinations of C9 ALS/FTD cases reveal TDP‐43 pathology (Mackenzie et al,2014; Saberi et al,2015), reminiscent of sporadic ALS cases, but also RAN proteins (i.e., dipeptide repeat proteins (DPRs)) (Zu et al,2013) and RNA foci (DeJesus‐Hernandez et al,2011).