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. 2011 Dec 12;6(12):e28388. doi: 10.1371/journal.pone.0028388

Figure 2. Frequency of CDSs occurrence in the 94 archaeal and 1,288 bacterial genomes.

Figure 2

Using single-linkage approach, the computed orthologs are organized in ortholog groups (OGs). Each CDS is clustered to an OG if it forms an ortholog pair with at least one CDS from the group and each CDS is included in one OG only. The x-axis lists 10 possible bins for the observed percentage of genomes in which CDSs from a particular OG are found. The y-axis denotes the fraction of all CDSs found for each bin. In agreement with previous reports, a significant fraction of CDSs are found only in a small percentage of genomes (less than in 10% of the considered archaeal or bacterial genomes, these also include singletons/orphans) forming the “accessory pool”; about 10% of the CDSs have orthologs in more than 90% of the genomes - the “extended core”.