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Cell proliferation (A) and cell death (B) assessed by MTT ((3-(4,5-methylthiazol-2-yl)-2,5-diphenyl-tetrazolium bromide)) and trypan blue exclusion assays in SH-SY5Y and IMR-32 NB cells unexposed and exposed to hypoxic conditions (1% O2) up to 24 h followed by reoxygenation for further 24 h. Results are expressed as percentages of the values detected in control cells. Each value is the mean ± SEM. *p < 0.05 and **p < 0.01 significant differences in comparison to unexposed cells.
