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Concentration of Pb, Cd and Hg in O. vulgaris depending on (A) organ type: muscle versus digestive gland; (B) sampling sites: Napoli versus Castellammare di Stabia. Vertical bars represent average concentration (µg g−1 wet weigth) ± SEM. Probability levels for significant differences: p < 0.001(***); p < 0.01 (**).
