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Fig. 4. Measurements of branchial lead accumulation in juvenile rainbow trout at various waterborne calcium concentrations in synthetic water for four different lead concentrations. Values are means ± 1 S.E.M. (N=7 per treatment). *Significant difference (P<0.05; two-tailed Student's t-test) from corresponding lead uptake in the presence of 1300 µmol l-1 calcium.