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Effect of age dependent exposure to Pb (50 mg Pb/l) on liver and kidney total thiol group concentration (mM) in female rats. The animals were treated for a period of 40 days (puberty) and 65 days (post puberty). Values are means±SD for groups consisted of 12–16 rats. Statistically significant differences are indicated by *P<0.05, ** P<0.01 compared with control group
