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The bacteria were grown in LB medium and LB plus Hx at 1.5, 5, and 10 mM for 18 h and then plated on KB agar plates to count the colony forming units (A). The transcript levels of psyI were determined by qRT-PCR. The relative expression levels of psyI were normalized to those of recA (B). The results represent the means and standard deviations from three different experiments.
