Amyotrophic lateral sclerosis (ALS), better known as Lou Gehrig’s disease, is a degenerative disease that affects motor neurons in the brain and spinal cord, preventing them from sending impulses to the muscles. Though the intellect remains intact, the muscles soon atrophy, causing weakness, paralysis, and eventual death. National attention was brought to the disease when Lou Gehrig died of it in 1941. What percentage of ALS cases is hereditary? Discuss
Source: The Free Dictionary