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The plastids of red algae, green plants, and glaucophytes may have originated directly from a cyanobacterium-like prokaryote via primary endosymbiosis. In contrast, the plastids of other lineages of eukaryotic phototrophs appear to be the result of secondary or tertiary endosymbiotic events involving a phototrophic eukaryote and a eukaryotic host cell. Although phylogenetic analyses of multiple plastid...
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