Highlights• Cytotoxic/genotoxic potential of titanium dioxide and zinc oxide nanoparticles-NPs were examined.• Both NPs significantly increased the frequency of aberrant cells and chromosome aberration/cell.• NPs increased sister chromatid exchange and DNA damage.• NPs decreased mitotic index in some treatments.• Results revealed cytotoxic and genotoxic potential of TiO2 and ZnO NPs in human lymphocytes.
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