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Unrooted 16S rRNA gene-based phylogenetic consensus tree displaying the affiliation of sponge-associated Crenarchaeota within group C1a (marine group I: Crenarchaeota). Bootstrap values under 50% were cut off after 100 resamplings. Bar: 1 nucleotide substitutions per 100 nucleotides. Numbers in parenthesis stand for the number of clones found in individual library.
