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AbrB levels decrease as cells exit the exponential phase of growth. Upper shows the activation of sdp at the end of stationary phase. The strain harbored amyE::Psdp-lacZ, and was otherwise wild-type (♦; RL4264). Lower shows the kinetics of AbrB and Spo0A accumulation in cells taken from the same culture as followed by immunoblot analysis. σA was used as a loading control. Cells were grown in liquid DS medium; hour 0 of sporulation was the end of the exponential phase of growth.
