Micronuclei and nuclear anomalies induced in the gastro-intestinal epithelium of rats treated with formaldehyde.

The induction of micronuclei and nuclear anomalies in cells of the gastro-intestinal epithelium of rats treated per os with formaldehyde (200 mg/kg) was assessed in comparison with N-methyl-N'-nitro-N-nitrosoguanidine as a positive standard