Phylogenetic analysis reveals is a human gut commensal from a previously unexplored taxonomic branch of . This novel branch of consists of polyphylectic sequence clusters (MP-I to MP-V) in which and closely related uncultured bacterial 16S rRNA gene sequences are phylogenetically placed in the MP-I cluster. The identity of 16S rRNA gene sequences from each MP cluster is given in Supplementary Information . Bootstrap values were calculated using 2000 re-samplings
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