SOD1 and amyotrophic lateral sclerosis: To test the immunoreactivity of our anti-SOD1int antibody in human cases, the double immunofluorescence staining with anti-SOD1int and anti-SOD1 antibodies was performed on the ventral horn of the lumbar spinal cord section of the SOD1-ALS patients with C111Y mutation (the case IV-6 in [26]; Additional file 1: Table S1).