In contrast, in the occipital cortex, a control brain region unaffected in ALS, we did not observe any change in expression of CHMP4B, CHMP2B, or VPS4 in C9orf72 ALS/FTD or sALS neuronal nuclei (Fig. 2b–e). The gene discussed is VPS4A; the disease is amyotrophic lateral sclerosis.