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Cellular ROS content measured in CACO-2 cells after exposure to SiQDs for 4 h and 24 h using H2DCFDA (2,7-dichlorodihydrofluorescein diacetate, Sigma-Aldrich, Gillingham, UK). The ROS contents (% of control) are indicated as means ± SD for n = 3 experiments. Significant effects (p < 0.05) are marked with an asterisk *.
