Safety, Tolerability and PK of ATTO 1091 in Healthy Adult Volunteers and Patients With Ulcerative Colitis

This is a 3-part study. Parts 1 and 2 will be a single and multiple ascending dose design, respectively, assessing the safety, tolerability, and PK of ATTO-1091 in healthy adult volunteers. Part 3 will consist of multiple doses in adult participants with ulcerative colitis to assess safety, tolerability, and PK.