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2-Chloro-4-methylthiobutanoic acid (CMBA, a mutagen from Japanese salted fish) at 15-500 mg/kg body weight induced several-fold increase in replicative DNA synthesis (RDS) (P < 0.05) after 80 min and 17 h, equivocal unscheduled DNA synthesis (UDS) after 80 min and necrosis 80 min after its administration in the stomach pyloric mucosa of F344 and ACI male rats. A positive control, N-methyl-N -nitro-N-nitrosoguanidine...
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