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Any of a large group of submicroscopic infective agents that are regarded either as extremely simple microorganisms or as extremely complex molecules, that typically contain a protein coat surrounding an RNA or DNA core of genetic material but no cell membrane, that are capable of growth and multiplication only in living cells, and that cause various important diseases in humans, animals, or plants.
A complete virus particle that consists of an RNA or DNA core with a protein coat sometimes with an external envelope and that is the extracellular infective form of a virus.
The protein shell that encloses a viral genome. It may be rod-shaped, polyhedral, or more complex in shape.
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