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Gene expression by cells in liquid DMM + MCPA exposed to 0 (control) or 10 μM CuSO4 measured by RT-qPCR as mRNA normalized to the DNA copy number of the corresponding gene. a Expression of the catabolic tfdA gene. b Expression of the putatively oxidative stress responsive ohr/osmC-like gene. Data are mean values from triplicate cultures from one representative experiment (the experiment was repeated twice). Error bars represent standard error of means
