RecruitingPhase 3Drug trialA Study to Evaluate the Pharmacokinetics, Safety and Efficacy of Afimkibart (RO7790121) in Children With Moderately to Severely Active Ulcerative ColitisThis Phase III, randomized, double-blind, multicenter, induction and maintenance study will evaluate the safety and efficacy of Afimkibart (RO7790121) in pediatric participants with moderate to severe active ulcerative colitis (UC).