SOD1 and amyotrophic lateral sclerosis: At 8 weeks expression levels of miR-9, miR-124a, miR-19a and -19b did not differ significantly between whole brains of G93A-SOD1, B6.SJL and Wt-SOD1 mice, except for miR-19a, which was significantly down-regulated in ALS brain (p < 0.05) (Figure 1).