 6. Patients not using aminosalicylates must have discontinued treatment at least 4 weeks prior to screening. Patients not using immunosuppressants such as azathioprine, 6-mercaptopurine, or methotrexate must have discontinued treatment at least 4 weeks prior to screening. Patients who had been receiving infliximab must have stopped therapy at least 8 weeks prior to screening. Patients who had been receiving adalimumab, cyclosporine, tacrolimus, or mycophenolate mofetil must have stopped therapy for at least 4 weeks prior to screening. 