Burmester GR, Yu DTY, Irani AM, et al. Ia+ cells in synovial fluids and tissue of patients with rheumatoid arthritis. Arthritis Rheum 1981;24:1370–6. Buttice G, Quinones S, Kurkinen M. The AP-I site is required for basal expression but is not necessary for TPA-response for the stro...