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Metabolic activity measured in MTT assay of neuron-like cells after 24 h incubation with different concentrations of (A) glucose and (B) insulin. Control—untreated neuron-like cells; DMSO—PC12 cells treated with DMSO. Statistically significant differences compared to the untreated neuron-like cells: ** p < 0.01, *** p < 0.001.
