intracellular symbiosis

intracellular symbiosis

[¦in·trə′sel·yə·lər ‚sim·bē′ō·səs]
(cell and molecular biology)
Existence of a self-duplicating unit within the cytoplasm of a cell, such as a kappa particle in Paramecium, which seems to be an infectious agent and may influence cell metabolism.
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This formation of an intracellular symbiosis from members of two different domains, and the integration of the two inherently incompatible alien genome cultures into a common nucleus, termed "cell symbiosis" by the author, took place 2.1 billion years ago at a very striking point of time in the Earth's history.
Elysia (= Tridachia) crispata is one of a few species of elysiid sea slugs that has an intracellular symbiosis of several months' duration with chloroplasts acquired from specific, siphonaceous algal food.

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