3. Alanine aminotransferase (ALT) >3X the ULN Currently pregnant, intending to become pregnant during the study period, or breast-feeding Use of immunomodulators (e.g., interleukins, interferons, cyclosporine), any vaccinations, systemic cytotoxic chemotherapy, or investigational therapy within 28 days prior to study entry. Chronic treatment with prednisone at a daily dose of 10 mg or less is permitted. Acute treatment (less than 21 days) with larger doses of corticosteroids for acute therapy is permitted.