RecruitingPhase 3Drug trialA Study of JNJ-78934804 in Participants With Moderately to Severely Active Ulcerative ColitisThe purpose of this study is to assess how well JNJ-78934804 works (efficacy) and how safe it is (safety) as compared to guselkumab at Week 48 in participants with moderately to severely active ulcerative colitis (UC, a chronic disease of the large intestine in which the lining of the colon becomes inflamed and develops ulcers).