Every few months for the past three years, Jeff Vierstra has been receiving infusions in his spine that target and disable a mutated gene that made it likely he would develop ALS.
Jeff Vierstra's mother and two sisters all died following complications from ALS, or Amyotrophic Lateral Sclerosis, but the scientist and skier is hoping an experimental treatment and the first known attempt to prevent the neurodegenerative disease c... [3189 chars]