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Relative expression levels of purF at the 3-h incubation time point (A) and asp23 (as a surrogate for sigB activation), sarA, RNAIII, and sae at 2-, 3-, 4-, 6-, and 24-h incubation time points (B) in 300-169p, 301-188p, and 301-188p::ϕSA169 strains. *, P < 0.05; **, P < 0.01; ***, P < 0.001; ****, P < 0.0001, versus 301-188p strain.
