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Effect of wblAch disruption on the transcription of whi genes. The RNA samples were harvested from strains grown on YMG agar medium overlaid with cellophane discs for 4 days. The expression level of whiA is presented relative to the wild-type sample, which was arbitrarily assigned a value of 1. The transcription level of hrdB was assayed as an internal control, and error bars were calculated by measuring the standard deviations among data from three replicates of each sample.
