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It is conceivable that fluctuations in the posttranslational control of ComK levels could introduce some extrinsic variations in ComK, but the fact that comS is transcribed equally in competent and noncompetent cells (20) argues against this possibility. It is also possible that the small extrinsic component of the noise in transcription could be magnified at the protein level if the ComK protein degradation rate was extremely low; however, stochastic simulations show that this is very unlikely in our case fig. S7; see SOM for further discussion
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It is conceivable that fluctuations in the posttranslational control of ComK levels could introduce some extrinsic variations in ComK, but the fact that comS is transcribed equally in competent and noncompetent cells (20) argues against this possibility. It is also possible that the small extrinsic component of the noise in transcription could be magnified at the protein level if the ComK protein degradation rate was extremely low; however, stochastic simulations show that this is very unlikely in our case (fig. S7; see SOM for further discussion).
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We verified this intuitive picture by using computer simulations of the complete model referred to previously fig. S5
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We verified this intuitive picture by using computer simulations of the complete model referred to previously (fig. S5).
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We acknowledge the assistance of S. Tyagi, S. Marras, and D. Gold for the gift of the repeat sequence plasmid, for the use of their spectrophotometer and microscope, and for the preparation of fluorescent probes. We also acknowledge D. Rudner for the gift of the codon-optimized CFP and C. S. Peskin for valuable discussions. We also thank S. Tyagi, A. van Oudenaarden, J. Gore, J. Tsang, M. B. Elowitz, G. M. Suel, and P. Mehta for comments on the manuscript, as well as an anonymous reviewer for insightful comments. This work was supported by NIH grant GM 57720. A.R. was supported by NIH grant GM 070357 and by NSF postdoctoral fellowship DMS-0603392.
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We acknowledge the assistance of S. Tyagi, S. Marras, and D. Gold for the gift of the repeat sequence plasmid, for the use of their spectrophotometer and microscope, and for the preparation of fluorescent probes. We also acknowledge D. Rudner for the gift of the codon-optimized CFP and C. S. Peskin for valuable discussions. We also thank S. Tyagi, A. van Oudenaarden, J. Gore, J. Tsang, M. B. Elowitz, G. M. Suel, and P. Mehta for comments on the manuscript, as well as an anonymous reviewer for insightful comments. This work was supported by NIH grant GM 57720. A.R. was supported by NIH grant GM 070357 and by NSF postdoctoral fellowship DMS-0603392.
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