Figure 2: 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.