MBGD provides several pre-computed ortholog tables, each of which is created using a different set of organisms. By default, the standard ortholog table is selected, which contains one genome from each genus, covering the entire taxonmic range. To see the global picture of the ortholog table currently selected, click "Orthologous Table" on the top page.
Ortholog Cluster Table Overview page is displayed. Here, you can see a histogram showing the distribution of the cluster size (the number of organisms included) in the default ortholog table.