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. 2008 Aug 29;4(8):e1000167. doi: 10.1371/journal.pcbi.1000167

Figure 4. The QS module represents an implementation of a more general regulatory motif.

Figure 4

(A) This motif entails constant production and decay of A and R, which bind reversibly to form C, the system output. Fast signal diffusion in the QS system corresponds to a fast turnover in A. (B) Assuming identical extrinsic noise inputs into A, R and C, faster turnover in A and R synergistically reduces the extrinsic noise in C. (C) If only R is directly affected by the extrinsic noise, faster turnover in A results in a slight increase in the extrinsic noise in C.