Virion

Virion
An infectious virus particle.
Virulence
The relative ability of an organism to cause disease.
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Virion assembly
In the case of the T4 phage, the construction of new virus particles is a complex process which requires special helper molecules to assist it. The base plate is assembled first, with the tail being built upon it afterwards.
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The virions attach to the surface of their host cell (a).
The proteins of the capsid inject the DNA core into the cell (b).
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Before a virus has entered a host cell, it is called a virion — a package of viral genetic material. Virions can be passed from host to host either through direct contact or through a vector, or carrier.
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(b) We have obtained packaging of 160-180 kb exogenous DNA into infectious virions using the human lymphotropic Epstein-Barr virus.
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virion A single virus particle. virus An obbligate intracellular parasite. A particle composed of a nucleic acid-protein complex that infects an intact host cell and uses that host cell's machinery for its replication.
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