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Elemental concentration in root shoot, vacuole, and cell wall of alfalfa. Concentration of Hg (a,b), Fe (c) and S (d) in alfalfa cultivated in different conditions of Hg and GSH: +Hg (40 μM), +Hg+GSH (40 μM Hg+50 μM GSH), and +GSH (50 μM GSH). Data represent means ± SD of three independent biological samples. Different letters indicate a significant difference at the p < 0.05 level.
