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Expression of spx-lacZ. (A) Cells were grown in CM. Time zero, onset of the stationary phase. ○, ORB4059 (wild type); •, ORB4065 (clpX::spc). (B) ORB4059 (wild type) was grown in CM (○), DSM (•), or 2× YT (□). β-gal. act., β-galactosidase activity.
