SOD1 and amyotrophic lateral sclerosis: Interestingly, at week 18, expression levels of miR-9 and miR-124a, but not miR-134, were significant lower in G93A-SOD1 whole spinal cord than in Wt-SOD1 spinal cord (p < 0.05 and p < 0.01, respectively), whereas miR-19a and -19b expression levels were significantly higher in ALS than Wt-SOD1 mice (p < 0.01 and p < 0.05, respectively) (Additional file 1: Figure S1).