SOD1 and amyotrophic lateral sclerosis: Various transgenic mice were tested, C57 BL6 mice corresponding to the original mouse background used to generate the other mouse types, wtSOD1 mice overexpressing the normal human SOD1, SOD1G93A mice overexpressing the human mutated SOD1 to induce ALS, SOD1G37R mice overexpressing the human mutated SOD1 to induce ALS (with a lower SOD1 expression than G93A) and Hlxb9-GFP mice expressing GFP under the Hb9 promoter (to generate GFP-expressing MNs).