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Salmonella mutagenicity of CSC samples representing three cigarette brands. Values shown are mean mutagenic potency values, in revertants per μg TPM ± standard error, for TA98, YG1041, and YG5161 with S9 activation. Bars accompanied by the same letter are not significantly different at P < 0.005. Employing the appropriate Bonferroni correction the critical P value is 0.0167.
