Distribution of binding sites numbers and correlation to gene expression. (a) Cumulative fraction of genes according the number of binding sites in their promoter region. (b) Expression variance averaged over all genes with like number of binding sites in their promoter. The dashed red line shows the best linear fit to the data points.
Bilu and Barkai Genome Biology 2005 6:R103 doi:10.1186/gb-2005-6-12-r103