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. 2006 Mar 31;2(3):e30. doi: 10.1371/journal.pcbi.0020030

Figure 5. Effect of Noise Due to the Presence of a Small Number of mRNA Molecules.

Figure 5

CV and τc, as in Figure 4, versus biochemical noise expressed as the average number of activator mRNA molecules per period. (A and C) Design I; (B and D) Design II. Filled circles correspond to a situation close to bifurcation in both designs and open squares to a value of the parameter Δ far from bifurcation. We fix the cell volume such as the system experiences intermediate noise strengths (coinciding with the maxima seen in Figure 4, where the number of activator molecules is ~500 in Design I and ~200 in Design II). Error bars are the size of data points.