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Influence of the different concentrations of ZnONPs on non-enzymatic antioxidant response in the seedlings and the stem-derived callus of L. usitatissimum. (a) The free radical scavenging activity (FRSA); (b) the total phenolic content (TPC); and (c) the total flavonoid content (TFC). Values are means ± SD of three independent experiments; * p < 0.05, ** p < 0.01, *** p < 0.001.
