Figure 2From: SIGffRid: A tool to search for sigma factor binding sites in bacterial genomes using comparative approach and biologically driven statisticsConservation of interesting words in promoter regions of orthologues. We search for pairs of conserved significantly over-represented words with approximately the same spacer in the two promoter regions: sp 2 - sp 1 = δ, δ ∈ {-1, 0, 1}.Back to article page