Basiliximab Maintenance in Ulcerative Colitis

Inclusion Criteria: 1. Previously met eligibility criteria in the previous basiliximab UC study 2. Must have a total Mayo score at entry consistent with clinical response or clinical remission. 3. Signed a current IRB/IEC-approved informed consent form 4. Females of childbearing potential must use an effective birth control method, and be willing to continue birth control during the study, and for 4 months after the last dose of study drug. 5. Females of non-childbearing potential should be surgically sterile (bilateral tubal ligation with surgery at least 6 months before study entry, hysterectomy, or bilateral oophorectomy at least 2 months before study entry) or post-menopausal for at least 2 years. Exclusion Criteria: 1. Subject is severely ill, as evidenced by more than 6 episodes of loose stools, all of them bloody, during a 24-hour period within the prior 7 days, concurrent with any of the following systemic features: * Heart rate \> 90 beats/min at rest * Temperature \> 37.8 degrees C * Hemoglobin \< 10.5 g/dL 2. Subject is currently receiving a restricted/prohibited concomitant medication 3. Subject has undergone colectomy (total, or subtotal) 4. Subject is pregnant or breast-feeding 5. Prior noncompliance with previous study visit schedule and requirements