| endosymbiont | An organism which lives within the body of another organism (its host) as part of an endosymbiotic relationship. (09 Oct 1997) |
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| endosymbiont hypothesis | The hypothesis that semi autonomous organelles such as mitochondria and chloroplasts were originally endosymbiotic bacteria or cyanobacteria. The arguments are convincing and although the hypothesis cannot be proven it is widely accepted. (18 Nov 1997) |