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Decay of nfrA mRNA before and after heat shock. RNA was isolated at different times after stress was applied. (A) Decay of the nfrA mRNA at 37°C. (B) Decay of the nfrA mRNA at 50°C. (C) Decay curves for the nfrA mRNAs at 37°C (empty circles) and 50°C (filled circles). The amount of RNA at time zero was set to 1 for both graphs. Times after the addition of rifampin are given.
