AbstractIsolated B cells from normal subjects and patients with systemic lupus erythematosus (SLE) could be stimulated to produce IgM anti‐DNA with pokeweed mitogen. Normal but not SLE allogeneic T cells abrogated this response. Normal but not SLE autologous T cells promoted a switch from IgM to IgG anti‐DNA production. SLE is characterized by at least two types of immunoregulatory abnormalities: a defect in T suppressor function and a defect in the IgM to IgG switcho
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