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Zinc ionophores inhibit proliferation of A549 cells. Exponential phase A549 cell cultures were treated with zinc complexes (A–D) at the indicated concentrations in the presence or absence of zinc acetate [0 μmol/L (black line), 25 μmol/L (blue line), 50 μmol/L (green line), and 100 μmol/L (red line)] for 72 h in duplicate experiments. Error bars, 1 SD.
