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σK-directed β-galactosidase synthesis during growth. Cells were grown in LB medium and induced. Samples were collected at the indicated times after induction and assayed for β-galactosidase activity. Symbols correspond to the following strains (each strain contains gerE-LacZ and produces pro-σk as well as the proteins indicated in parentheses): ▴, OR928 (SpoIVFA, SpoIVFB-GFP); •, OR926 (SpoIVFB-GFP); □, OR936 (σK); ⋄, OR930 (SpoIVFA); ○, OR934 (SpoIVFB); ▵, OR924 (SpoIVFA, SpoIVFB).
