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. 2008 Dec 10;105(51):20245–20250. doi: 10.1073/pnas.0804953105

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© 2008 by The National Academy of Sciences of the USA

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Fig. 4. — Consequences of the predicted free RNAP concentration. (A) Growth-rate-dependent regulation of the rrn promoters: Effective promoter strengths for the rrn promoters P1 (black), P2 (gray), and the pair P1-P2 (white) as calculated from the transcription rates measured in ref. 14. (B) Predicted mRNA expression for over- and under expression of RNAP and comparison with data from ref. 37. (C) Passive control during the stringent response: Concentration of free RNAPs during the stringent response relative to the concentration during the exponential growth (with a rate of 2.5 doublings per hour) before starvation.