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. 2009 Aug;28(8):371–382. doi: 10.1089/dna.2009.0872

FIG. 1.

FIG. 1.

Genome size ranges for obligately host-associated and free-living bacterial species. Host-dependent bacteria typically undergo severe genome reduction. Primary mutualists of insects include the smallest bacterial genome known, the 160 kb chromosome of Carsonella associated with psyllids (Nakabachi et al., 2006).