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Comparison of relative % difference between mean 1R6F- and 3R4F-specific activities (revertants/mg TPM) to 3R4F long-term variability.
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Note: 
statistical analysis not done because at least one test item was determined to be non-mutagenic overall.
The relative (%) difference is compared to the calculated 3R4F long-term variability for the assay statistic to determine if the difference exceeds the long-term variability of the Ames test method.
