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Objective: Erythrocyte pyrimidine 5'-nucleotidase (Pyr-5'-N) is highly sensitive to heavy metal inactivation in vitro and in vivo, and a number of studies have verified its usefulness as a biomarker of acute and chronic lead exposures. Retrospective and prospective studies attempted to determine whether the known linearity of Pyr-5'-N inhibition by lead concentrations above 40 μg/dL whole blood might...
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