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Phylogeny of 16S rRNA sequences of leech-associated symbionts in the context of other animal symbionts and various proteobacteria, rooted with gram-positive taxa. The tree is a strict consensus of two equally parsimonious trees depicted as a phylogram. Jackknife support values greater than 75% are indicated. The five bacterial clades or lineages associated with blood-feeding leeches are outlined with dashed boxes.
