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. 2013 Jan 23;8(1):e54783. doi: 10.1371/journal.pone.0054783

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4. Phylogenetic tree showing the most abundant OTUs within the Firmicutes phylum. Phylogeny is based on 400 bp alignment of the V4–V5 of the 16S rRNA gene showing, together with the closest matches from the Ribosomal Database Project. Together these 8 OTUs comprise 12.3% of the total sequences and 33.2% of those within the Firmicutes phylum. RDP sequences are labelled with their “S” accession number and taxonomic assignment. Coloured symbols indicate the distribution of OTUs (defined as 97% sequence similarity) that are shared between hosts; (green ▪) humans, cattle and chimpanzees, (blue ♦) humans and chimpanzees, (lilac ▾) humans only. Each OTU name consists of its taxonomic assignment and a unique numerical identifier. Scale bars indicate the number of base substitutions per site.