Figure 2

Distribution of synolog groups, synolog fractions and average synolog sequence identity for carbohydrate metabolism genes. Distribution of a) number of synolog groups, b) synolog fractions and c) average synolog sequence identity at the protein level for carbohydrate metabolism synologs in a data set consisting of 943 [a)-b) ] or 897 [c) ] bacterial and archaeal genomes, illustrating that a high fraction of very similar carbohydrate metabolism synologs is rare among the genomes included in this analysis. Synologs are here defined as intra-genome sequences assigned to the same FIGfam in the SEED database [19]. The synolog fraction describes the ratio of the total number of carbohydrate metabolism synologs relative to the total number of carbohydrate metabolism genes in a genome.