Effect of exposure route, regimen, and duration on benzene-induced genotoxic and cytotoxic bone marrow damage in mice.

Error bars indicate 95% confidence limits. and then by a second increase in MN-NCE levels at the end of the study. MN-PCE Levels Exposure to benzene by inhalation or by gavage in- duced a highly significant increase (p < 0.0001) in the fre- quency of MN-PCE detected in the peripheral blood of mice (Figs. 2 and 3; Table 2).

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