Interestingly, a similar analysis conducted by us (Figs. S1–S3) for some other ALS risk factors such as angiogenin (ANG), Interferon Kappa (IFNκ) and NADH:Ubiquinone Oxidoreductase Subunit B6; (NDUFB6) reveals that these same genes are also absent in the four species mentioned above. Here, NDUFB6 is linked to amyotrophic lateral sclerosis.