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Synthesis of cma and ssb mRNAs following a temperature downshift from 28 to 18 °C and addition of chloramphenicol (100 μg mL-1). Total RNA was isolated from samples withdrawn from PG4180 cultures at different time points and subjected to RNA spot blot analysis using cma- and ssb-specific probes. The amount of detected mRNA at zero minutes was considered as 100%. Quantitative data represent averages of two experiments with six replicates.
