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Viruses consist of a small collection of genetic material (DNA or RNA) encased in a protective protein coat called a capsid. (Retroviruses are among the infectious particles that use RNA as their hereditary material.
Around that is the genome, which may or may not be surrounded by a capsid. the core of the virus is the capsid. The genome surrounds the capsid, and the virus may or may not have an outer layer called an envelope.