The size of the intergenic regions between the end of the stop codon for each gene, and the start codon of the next gene are displayed for each organism and each gene of this cluster. The numerical values for Ig region length are given in table 2. The three panels display the Ig sizes for the S10, spc, and alpha operons.
As can be seen, Mg and Mp show remarkably small (along with a number of negative size) intergenic region lengths in comparison with all of the other organisms. Ec and Hi show some of the longest Ig lengths for individual genes, but in general, Uu, Mc, and Bs show the longest Ig sequence lengths (see the median values below). The size of these regions does vary from gene to gene, with a few showing conservation among all of the organisms (L4, L16, and L29), but a few that vary widely (S10, L23, S17, secY, L36, and S11). Not surprisingly, some of the greatest variability comes at the end of the individual operons, or at positions where some of the gene insertions/deletions occur in comparisons between these organisms (secY and S11).
Average and Median values for Ig length are given below:
| Organism | Average | Median | |
|---|---|---|---|
| Uu | 19.7 | ±13.0 | 19.5 |
| Mg | 1.9 | ±5.3 | 2.5 |
| Mp | -0.8 | ±14.7 | 0.0 |
| Mc | 24.7 | ±29.7 | 19.0 |
| Bs | 40.9 | ±62.2 | 28.0 |
| Ec | 26.7 | ±39.0 | 15.0 |
| Hi | 43.6 | ±87.7 | 16.5 |
