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Growth of E. coli in liquid medium with and without 2 μg of tetracycline per ml. Values are means ± 95% confidence limits. All readings were means of triplicate samples except for those of pKK1058C-containing E. coli, which were means of nine samples (three each of pKK1058C-1, -2, and -3). OD580, optical density at 580 nm.
