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Cytotoxicity of airway epithelial cells in response to exposure to the different amphibole samples. Percentage of lactate dehydrogenase (LDH) leakage into the supernatant following a 24 h exposure to the highest dose (26.4 μg/cm2) of amphibole particles. * = Significant difference between treatment and no-treatment control. Difference is deemed significant when p < 0.05.
