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. 2020 Sep 4;259(2):449–458. doi: 10.1007/s00417-020-04900-8

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© The Author(s) 2020

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Fig. 4 — Total reactive oxygen species (ROS) concentration under normoxic (white bars) and hypoxic conditions (blue bars) using 150 μM CoCl₂ for 48 h in normal and KC-HCFs. KC-HCFs show a higher ROS level than control cells. The concentration of ROS is reduced in both cell types following hypoxia. Data were presented as mean ± SEM of 8 independent experiments. Significant differences are indicated