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Fig. 3. Total Hg concentration in the pooled pseudofaeces of 20 mussels that were kept in seawater for 3 weeks (Control), then exposed daily to 20 µg l-1 inorganic Hg for 3 weeks (Exposure), followed by transfer to Hg-free seawater for a further 3 weeks (Recovery). Vertical bars represent means ± S.E.M. (N=3).