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Phylogenetic tree of the 16S rRNA genes in the three domains Archaea, Bacteria, and Eucarya. The procaryotes comprise the archaeal and bacterial domains. The eucaryotes contain solely the domain Eucarya. This unrooted tree was calculated by the minimum evolutionary algorithm in the software MEGA4 (48). The tree is drawn to scale, with branch lengths in evolutionary distance calculated by the maximum composite likelihood method and units of numbers of base substitutions per site.
