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). The gene discussed is RAN; the disease is frontotemporal dementia.