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Tannic acid induced Nuclear Factor erythroid-2-Related factor 2 (NRF2) expression in kidneys. Protein expression of NRF2 determined by immunostaining (40X; A–B) or by western blot (C). Quantification of fluorescence intensity for NRF2 immunostaining (B). n = 8, values are mean ± SD, * p < 0.05.
