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A viral capsid is the protein shell that encases and protects the genetic material of a virus. It plays a crucial role in the infectivity and stability of the virus.
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capsomere: Protein subunit that makes up the viral capsid.
viral envelope: Lipid membrane derived from host cell membranes that surrounds some viruses' capsids.
virion: Complete virus particle that includes both nucleic acid and a protein coat, and sometimes an envelope.