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Concentration dependence of blood cytokine release from healthy donors stimulated with Borrelia lysate. Human whole blood diluted 1:5 was incubated without a stimulus (con) or in the presence of Borrelia lysate (0.1 to 100 μg/ml) for 24 h at 37°C. Cytokine levels in the cell-free supernatant were measured by ELISA. Data are depicted as means ± SEM of results from four healthy donors.
