C9orf72 and amyotrophic lateral sclerosis: Indeed, the resulting antibodies, which specifically detect poly(GA) protein and no other c9RAN proteins (Online Resource 1d), stain inclusions throughout the CNS of c9FTD/ALS cases (Fig. 1a–f; Table 2) but not age-matched FTLD-TDP and ALS cases without the C9ORF72 repeat expansion (Online Resource 1e).