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Concentrations of selenium (Se; ng/g ww) in whole blood (A) and serum (B) in relation to the concentrations of Hg in blood of prime aged polar bears. Glutathione peroxidase activity (mUnits/mg Hb) in relation to concentrations of Hg (C) and the molar ratio of Se: Hg (D) in blood of prime aged polar bears. General linear models were used to assess relationships between biomarkers and toxicants with sex as a covariate.
