Fig. 5
From: Mix-and-matching as a promoter recognition mechanism by ECF σ factors
Correlations between the spacer element and the total promoter strength: The upper (a), middle (b) and lower (c) panels in the figure correspond, respectively, to in-vitro inactive, all promoters and in-vitro active sets. In all three panels the spacer motif strength is correlated with the total promoter strength. The correlation constants and P values are also indicated for each panel. The total promoter strength corresponds to the sum of all the element strengths (the strength of the spacer element is not included in the sum)