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Endosymbiont (also known as intracellular symbiont) is any organism that lives within cells of another organism. For instance, some nitrification? bacteria and cellulose-digesting protozoa.
A few organelles of eukaryote cells probably originated as reduced endosymbiotic prokaryotes, namely the mitochondrion and chloroplast. Both of these have double membranes - the inner one corresponding to the bacterium, the outer to the cell - and contain some DNA, but this does not code for parts outside the organelle is the DNA in the nucleus does.
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Last edited November 30, 2001 11:11 am (diff)
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Wikipedia: Endosymbiont