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Transcriptional expression of paa genes in AS 1.542 (wild type) and the AS 1.542/paaRΔΗΤΗ mutant. Cells were cultivated in mineral medium with 5 mM glucose or 5 mM PAA as the sole carbon source. The ratios of mRNA levels were calculated relative to strain AS 1.542 grown on glucose and are presented on a logarithmic scale. Gene names are indicated at the bottom. The betB gene is located outside the cluster and was used as a negative control.
