A candidate division, candidate phylum or candidate division-level is a lineage of Prokaryotic organisms for which no cultured representatives have been found, but evidence of the existence of the clade has been obtained by 16S rRNA metagenomic analysis of environmental samples.
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The candidate division TM7, is a major lineage of Bacteria, the existence of which is known solely through environmental 16S rRNA sequences as to date no species has been grown in the lab, a requirement for taxonomy, making it a candidate phylum.