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Excerpts from EF-1α/Tu protein sequences showing a conserved insert (originally identified by Rivera and Lake [198]) that is present in various Crenarchaeota archaebacteria (eocytes), as well as eukaryotic homologs, but absent in Euryarchaeota archaebacteria and eubacteria. This insert indicates that of the two archaebacterial groups, Euryarchaeota, are ancestral.
