This transgenic subline (designated G1H in J:76718) is derived from the G1 parental transgenic line (originally described in J:32665). This line carries a 40% expansion in transgene copy number compared to the original G1 line (described in J:32665, in MGI as Tg(SOD1*G93A)2Gur). The transgene construct is composed of the human SOD1 gene carrying a glycine to alanine transition at position 93 (G93A). The G93A mutation does not alter the activity of the protein. This line carries a high copy number maps to Mus Chr12:97,165,800 (coordinates from MGSC ver 37, mm9).