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CD40 ligand (CD40L, CD154) is overexpressed on T and B cells in systemic lupus erythematosus (SLE). Monocytes have been shown to contribute to immune-mediated pathology in SLE and to express CD40L under certain conditions. Therefore, we studied CD40L expression on lupus monocytes ex vivo, as well as after activation in vitro. A highly significant sevenfold increase in the frequency of CD40L-expressing...