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Relative toxicity and bioactivity in the C57BL/6 alveolar macrophage model. A) Mean ± SEM cell viability by MTS assay after 24 hours of particle exposure. B) Mean ± SEM IL-1β release after 24 hours of particle exposure with LPS co-culture. Asterisks *** indicate P < 0.001, ** P < 0.01 or * P < 0.05 compared to 0 μg/mL control condition.
