FIG 5.

Molecular phylogeny of the methanogenic archaeal endosymbiont of an anaerobic scuticociliate strain, GW7. The tree displays an ML phylogeny of seven clones of the endosymbiotic methanogenic archaeon derived from an anaerobic ciliate strain, GW7, together with related species/clones of the family Methanoregulaceae. An alignment of 1,298 nucleotide sites of the archaeal 16S rRNA gene was used. The origins or sources of isolation of species/clones are presented in parentheses. Accession numbers in the DDBJ/EMBL/GenBank DNA database are shown in square brackets. Bootstrap support values higher than 70% are depicted on or below the internal branches. *TCE, trichloroethene.