Figure 1. Mutant frequencies (Mean ± SE) in liver from λ transgenic medaka exposed to PFOS at 0 (0.1% DMSO), 6.7, 27.6 and 87.6 μg/L for 30 days followed by a recover period of 15 days in clean system water.
*P < 0.05; **P < 0.01.
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