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The genotoxic effects of methyl bromide were investigated in a DNA-binding study. [14C]Methyl bromide was administered to male and female F-344 rats orally, or by inhalation from a closed exposure system. DNA adducts were detected in the liver, lung, stomach and forestomach. [14C]3-Methyladenine, [14C]7-methylguanine and [14C]O6-methylguanine were identified using a combination of three different methods of hydrolysing DNA, followed by HPLC or gas chromatography-mass spectrometry. After both oral and inhalation exposure, the highest levels of methylated guanines, especially those of [14C]O6-methylguanine, were found in the stomach and forestomach of the rats. These results clearly demonstrate a systemic DNA-alkylating potential of methyl bromide.
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