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Figure 3. Universal phylogenetic tree based on comparison of SSU rRNA sequences. Sixty-four rRNA sequences representative of all known phylogenetic domains were aligned, and a tree was produced with fastDNAml (Olsen et al., 1994). That tree was modified, resulting in the composite one shown, by trimming lineages and adjusting branch points to incorporate results of other analyses. The scale bar corresponds to 0.1 changes per nucleotide (from Pace, 1997).