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Abstract
Viruses are infectious particles that are composed of a nucleic acid core (either DNA or RNA) surrounded by a protein coat or capsid. The capsid is composed of distinct morphological units called capsomeres which determine the symmetry of the virus. Thus viruses may have helical symmetry if the capsid has a coil-like structure or an icosohedral symmetry. Some viruses, e.g., the herpes viruses, have an outer envelope which may be derived from the host cell membranes.
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