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Role of σS for ricI expression. (A) Same as Fig. 2C (lanes 1 and 2), but RicI::GFP expression was monitored in a Salmonella ΔrpoS strain. (B) 5′-RACE analysis of the ricI transcriptional start site. C, control (genomic DNA); M, DNA size marker; T−, no TAP treatment; T+, TAP-treated samples.
