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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.
Capsids are the protein coat that protects viral genomes. They are made from one or a few proteins that form repeating units that assemble around the genome. The three major types of capsid that protect viral genomes are: Helical Capsid.