Presence of a mitochondrial-type 70-kDa heat shock protein in <i>Trichomonas vaginalis</i> suggests a very early mitochondrial endosymbiosis in eukaryotes

Abstract excerpt

Molecular phylogenetic analyses, based mainly on ribosomal RNA, show that three amitochondriate protist lineages, diplomonads, microsporidia, and trichomonads, emerge consistently at the base of the eukaryotic tree before groups having mitochondria. This suggests that these groups could have diverged before the mitochondrial endosymbiosis. Nevertheless, since all these organisms live in anaerobic environments,...

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