Concept

Endosymbiont

Summary
An endosymbiont or endobiont is any organism that lives within the body or cells of another organism most often, though not always, in a mutualistic relationship. (The term endosymbiosis is from the Greek: ἔνδον endon "within", σύν syn "together" and βίωσις biosis "living".) Examples are nitrogen-fixing bacteria (called rhizobia), which live in the root nodules of legumes, single-cell algae inside reef-building corals and bacterial endosymbionts that provide essential nutrients to insects. The history behind the concept of endosymbiosis stems from the postulates of the endosymbiotic theory. The endosymbiotic theory (symbiogenesis) pushes the notion of bacteria exclusively living in eukaryotic organisms after being engulfed by them. This is popular with the concept of organelle development observed with eukaryotes. Two major types of organelle in eukaryotic cells, mitochondria and plastids such as chloroplasts, are considered to be obtained from bacterial endosymbionts. There are tw
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