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a single cyanobacterium endosymbiont, which was taken in about 1.6 billion years ago by an ancestral archaeplastidan (and subsequently adopted into other eukaryote groups through secondary endosymbiosis events, and later tertiary and quaternary endosymbiosis, etc.). The only exception is the ciliate Pseudoblepharisma tenue, which in addition to a photosynthetic symbiont that is a captured green

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