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Phylogenetic context of major phylum or class-level lineages of cultured and uncultured Archaea, as estimated by the ARB neighbor-joining algorithm. Sites with nucleotides at least 60% conserved within all Euryarchaeota included in the tree were used in the analysis for Euryarchaeota and Crenarchaeota together. Certain lineages, such as Methanopyrus kandleri, were excluded due to their tendency to attract hyperthermophiles to the base of the tree.
