To investigate this, the number of ADMA-GR and SDMA-GR inclusions were quantified in the frontal cortex of 37 C9orf72 cases (C9orf72-FTLD n = 22, C9orf72-ALS n = 15; details in Supplementary Table 1) and correlated with age at disease onset, age at death, disease duration and post-mortem delay (Supplementary Table 2). This evidence concerns the gene C9orf72 and amyotrophic lateral sclerosis.