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IL-12 production from AM and PM stimulated with LPS. Cells (5·0 × 105/well) were incubated for 24 h with the indicated concentrations of LPS. The amount of IL-12 released into the culture medium was determined by ELISA. Values are expressed as means ± s.d. of cells isolated from 5 participants. □, Alveolar macrophages; ○, peripheral monocytes.
