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DNA strand breaks and Fpg-sensitive sites in BEAS-2B cells after 3- or 24-h exposure to TiO2 NM100, NM101 or NM103 (1, 5 or 15 μg/ml) assessed using mini-gel alkaline comet assay and Fpg-modified version, respectively. *P < 0.05, **P < 0.01, ***P < 0.001. C+, 2 µM Ro together with light irradiation.
