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Summarized results of lung burden measured in male and female of rats exposed to 3 concentrations at week 2, week 13, and week 104 of inhalation exposure studies. Concentrations: 0.2, 1, and 5 mg/m3 in 2-week and 13-week studies, and 0.02, 0.2, and 2 mg/m3 in 2-year study.
