Figure 1.

Phyletic patterns of COGs. All, represented in all unicellular organisms included in the COG system; All archaea, All bacteria, All eukaryotes, represented in each species from the respective domain of life (and possibly in some species from other domains); All bacteria except the smallest, represented in all bacteria except, possibly, parasites with small genomes (mycoplasma, chlamydia, rickettsia, and spirochetes).

Tatusov et al. BMC Bioinformatics 2003 4:41   doi:10.1186/1471-2105-4-41
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