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An endosymbiont or endobiont is any organism that lives within the body or cells of another organism, i.e. forming an endosymbiosis
Endosymbiont
a endosymbiont dinoflagellate of common corals. My aid in photosynthesis and subsequently the building of reefs.
endosymbiont
From early prokaryotes that lived symbiotically with eukaryotic cells
Margules endosymbiont theory