Increase in the number of motor neurons in spinal cords of AMD3100 following treatment. SOD1G93A mice were treated with AMD3100 (n=3)or PBS (n=3) starting at 50 days old and sacrificed at 110 days old. Fifteen nonadjacent sections per group of lumbar spinal cords were stained with thionin and analyzed. Results are mean Âą S.E.M. (TIF 191Â kb