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The effect of 24 h exposure to p-coumaric acid (70 μg/mL), chrysin (5 μg/mL), ferulic acid (50 μg/mL), and caffeic acid (65 μg/mL) on intracellular proline concentration in CAL-27 cell culture. The mean values ± SEM from three experiments done in duplicates are presented (n = 6). The stars indicate which values were significantly different (∗p < 0.001) compared with control.
