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Effects of ppGpp on Shiga toxin-converting phage DNA amount after prophage induction. Amounts of DNA of phages ϕ24B, 933W, and P27, in E. coli strain MG1655 (triangles) and its relA spoT derivative (ppGpp0) (squares) either without prophage induction (open symbols) or after induction with mitomycin C (1 μg ml−1) at time zero (closed symbols), were measured. The results are mean values from 3 experiments, with error bars representing SD.
