Fig 1.

Changes in the levels of speB and ropB transcripts during growth. (A) S. pyogenes cells were continuously grown in C medium from early exponential phase to early stationary phase. (B) An aliquot of cell culture from the late exponential phase was diluted 1:20 in fresh C medium and incubated for 2 h. qRT-PCR analysis was used to determine the levels of speB and ropB transcripts at different time points. Data are presented as means ± standard deviations (error bars) from three (A) or two (B) independent experiments.