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Distribution of the COGs by the number of phylogenetic lineages. Typically, a lineage is represented by only one species. However, the following pairs of (relatively) close bacterial species were merged and treated as a single entity prior to the COG construction: Mycoplasma genitalium and Mycoplasma pneumoniae, Chlamydia trachomatis and Chlamydia pneumoniae, Escherichia coli and Haemophilus influenzae, and two strains of Helicobacter pylori.
