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Representative HepG2 Comet nucleoids treated without or with formamidopyrimidine-DNA glycosylase (FPG), to reveal oxidative damage to DNA. (A) Negative control (dimethyl sulfoxide, DMSO only). (B) Cells exposed to the crude extract from sediment S1 [100 mg sediment equivalent (SEQ)/mL]. (C) Cells exposed to the crude extract from sediment S2 (200 mg SEQ/mL).
