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A systematic study was carried out on the relationship between the cytotoxicity of quantum dots (QDs) and free cadmium ions using CdCl 2 solution with known amounts of Cd 2+ as the control. We found that the CdTe QDs were more cytotoxic than CdCl 2 solutions even when the intracellular Cd 2+ concentrations were identical in HEK293 cells treated with them, implying the...
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