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Relative mRNA concentrations of cbpA, cps2A, ply, and psaA in D39 and the clpL and clpP mutants before and after heat shock as determined by real-time RT-PCR. Between RNA extracts, levels of individual mRNA species were corrected with reference to that obtained for the internal 16S rRNA control. Data points represent means ± standard deviation of quadruplicate samples from each RNA extract.
