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VirusesPlease note that 'Karyn's Genomes' pages are no longer being maintained. The pages will be retired from 2can during the first half of 2012. Ensembl Genomes has no relationship with this project Viruses are sub-microscopic, obligate intracellular parasites. Virus particles are produced from the assembly of pre-formed components, and these particles (virions) do not 'grow' or undergo division. Viruses lack the genetic information which encodes apparatus necessary for the generation of metabolic energy or for protein synthesis (ribosomes). They depend on the host cells that they infect to reproduce.
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