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Loss of sigma factor σ28 in environmental chlamydia. Phylogenetic analysis under the GTR model in PhyloBayes supports a scenario in which the Chlamydiaceae σ28 was inherited from the Verrucomicrobia (PP = 0.92), and an ancient loss of this protein occurred in the environmental chlamydia. The topology of the gene tree for the Chlamydiaceae is largely congruent with the species phylogeny. Arrow indicates outgroup consisting of various representatives of different bacterial phyla.
