A Study to Evaluate the Efficacy and Safety of BIIB059 in Adult Participants With Active Systemic Lupus Erythematosus Receiving Background Nonbiologic Lupus Standard of Care (TOPAZ-2)

A Study to Evaluate Higher Dose (HD) Nusinersen (BIIB058) in Participants With Spinal Muscular Atrophy Previously Treated With Risdiplam

A Study to Assess the Safety of BIIB122 Tablets and if it Can Slow the Worsening of Early-Stage Parkinson's Disease in Participants Between the Ages of 30 and 80