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Decay of the λO protein at 30°C (triangles) and after a shift to 43°C (circles) in the groE44 mutant harboring λcro+ (pKB2) and pGELS2 plasmids, untreated (A) or treated with aCT at 0.05 μg/ml (B), 2 μg/ml (C), or 25 μg/ml (D) at the time of the temperature shift (arrow).
