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Comparison of zinc levels in different tissues after chronic exposure to ZnCl2 at different concentrations for 21 days. Adult zebrafish were incubated with different concentrations of ZnCl2, and the relative amounts of zinc accumulation in (A) brain, (B) muscle, (C) gill, and (D) liver tissues were measured using enzymatic assays. Data are represented as means ± SEM. Statistical analysis was compared to control using a t-test (** p ≤ 0.01; **** p ≤ 0.0001).
