Fig. 2.

(A) Numbers of shared orthologs and unique genes in G. apicola and S. alvi genomes. (B) Gene content as categorized by the Kyoto Encyclopedia of Genes and Genomes (KEGG) subsystem. Within genomes, ∼50% of genes were not assigned to a category and ∼28–38% of predicted genes were annotated as hypothetical or putative; these are not shown here. (C) Pairwise dS values of all orthologs, plotted against each other (e.g., the ∼1:1 relationship of red points shows that genes are equally divergent between the Apis symbiont and either of the Bombus symbionts). dS values extend from 0 to 4 on all axes.