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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.
Virus particles, called virions, contain a core of genomic information that is either DNA or RNA. The core is surrounded by a protein shell called a capsid, and together the capsid and core are called the nucleocapsid.n enveloped viruses, the virion inserts its own proteins and lipids into the host-cell derived membrane. These proteins can include a matrix protein (M protein), which is in contact with the nucleocapsid and lines the inner side of the envelope.