Endosymbiosis Among Protists, Revisited
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Mitochondria, per Bio 0274 and Bio 1821, trace to one primary endosymbiotic event; among protists, that same engulf-and-retain pattern also produced chloroplasts.
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A cyanobacterium engulfed by an early eukaryote became the ancestor of chloroplasts in the lineage now called Archaeplastida.
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This entry extends endosymbiosis to chloroplast origin— it does not reopen the separately unsettled question of the nucleus's origin.