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This paper describes the screening studies of 104 commercial crude drugs for mutagenicity by the rec-assay with Bacillus subtilis as well as the reversion assay with Ames strains TA98 and TA100 of Salmonella typhimurium. The rec-assays showed that 13 water extracts and 27 methanol extracts of the crude drugs were positive. The Ames assays with or without metabolic activation showed that 24 water extracts and 16 methanol extracts were mutagenic. In total, mutagenic activities were found in 45 samples among the 104 crude drugs tested.
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