As expected, the two best anti‐GP clones 18H8 and 3F9 specifically detected neuronal cytoplasmic poly‐GP inclusions by immunohistochemistry in a c9ALS/FTD patient, but not in a C9orf72‐negative ALS/FTD case (Fig 1A). This evidence concerns the gene C9orf72 and frontotemporal dementia.