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Stability of the hspA transcript after heat induction. Cultures that had been prepared at 34°C were incubated at 44°C for 20 min. Rifampicin was added at 50 μg mL−1 to the cultures 20 min after the temperature shift (as indicated by arrows). Squares and circles indicate wild-type and ΔHik34 cells, respectively. Black symbols and white symbols indicate with and without addition of rifampicin, respectively.
