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The ML phylogenetic tree of archaea constructed by using concatenated alignments of ribosomal proteins. Thick solid lines indicate internal branches with Resampling of Estimated Log-Likelihoods bootstrap support >95%, thin solid lines indicate branches with 90–95% bootstrap support, and dotted lines indicate branches with <70% support. Distances are indicated in substitutions per site. Methanogens are highlighted. Species name abbreviations are as in Fig. 2.
