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Transcription analysis of pump genes ttgA and srpA. (A) Quantitative RT-PCR analysis of the genes srpA and ttgA. The relative expression levels of the genes were measured using RNA extracted from P. putida B6-2 grown with or without BP. (B) Analysis of promoter activity. β-Galactosidase activity was measured with or without BP. Data represent the averages from three parallel replicates ± SDs.
