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Example photographs of the C28/I2 human chondrocyte cell line in the cell viability test when the cells were untreated (A) and treated with IL-1β 10 ng/mL (B), IL-1β 10 ng/mL + MSE 100 μg/mL (C), and IL-1β 10 ng/mL + MSE 150 μg/mL (D) for 24 h (magnification × 100).
