RecruitingPhase 2Drug trialA Study to Evaluate the Efficacy, Safety, and Pharmacokinetics (PK) of RO7837195 in Participants With Moderately to Severely Active Ulcerative Colitis (UC)The purpose of this study is to evaluate the efficacy of RO7837195 compared with placebo in participants with moderately to severely active ulcerative colitis for whom prior treatment with conventional and/or advanced therapies has failed.