Figure 3From: Adaptation of the short intergenic spacers between co-directional genes to the Shine-Dalgarno motif among prokaryote genomesSD presence and stop codon usage among the co-directional gene pairs. Percentage of genes with a predicted SD sequence divided by the number of genes without a predicted SD sequence (A) and ratio of TAA usage to TGA and TAG usage as a stop codon (B) among the spacing lengths analyzed. The bars correspond to the ranges of spacing length studied and defined in the text.Back to article page