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Phylogenetic analysis of dihydrolipoamide dehydrogenase (L protein). The phylogeny of L proteins, with Bayesian posterior probabilities superimposed upon the tree, is shown. Horizontal branch lengths are representative of evolutionary change. The phylogeny strongly supports different origins of the T. vaginalis protein from that of other eukaryotic homologues, with common ancestry shared between the firmicute bacteria forms and the T. vaginalis protein.
