Abstract
Methylene chloride (MC) has been evaluated for its ability to induce micronucleated polychromatic erythrocytes (MPEs) in the bone marrow of treated mice. Groups of five male and five female C57BL/6J/Alpk mice were exposed, by gavage, to doses of 4000, 2500 and 1250 mg/kg MC in corn oil, the highest dose-level being selected to be the maximum tolerated dose. Bone marrow samples were taken 24, 36, 48 and 72 h after dosing. No significant increases in the incidence of MPEs over controls were observed for any of the test groups, and it is concluded that MC is not clastogenic in this assay.
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