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Fig. 2. Unidirectional branchial calcium influx rates in juvenile rainbow trout at various waterborne calcium concentrations in synthetic water for four different lead concentrations. Control fish, black circles; fish exposed to 0.46±0.03 µmol l-1 dissolved lead, white triangles; 2.5±0.2 µmol l-1 lead, white circles; 4.9±0.3 µmol l-1 lead, white squares. Values are means ± 1 S.E.M. (N=7 per treatment).