Researchers at Apellis Pharmaceuticals are seeking individuals living with sporadic amyotrophic lateral sclerosis (ALS) to participate in a two-year phase 2 trial (MERIDIAN) to determine the efficacy of the investigational drug pegcetacoplan. Pegcetacoplan is designed to reduce the activity of the complement system (a component of the immune system), and potentially slow the progression of ALS. . . .