For the leaf bug, see
Miridae. A capsid is the protein shell of a
virus. It consists of several
oligomeric subunits made of
protein. The capsid encloses the
genetic material of the virus.Capsids are broadly classified according to their structure. The majority of viruses have capsids with either
helical or
icosahedral structure. Some viruses, such as
bacteriophages, have developed more complicated structures. The icosahedral shape, which has 20 equilateral triangular faces, approximates a
sphere, while the helical shape is cylindrical. The capsid faces may consist of one or more proteins. For example, the foot-and-mouth disease virus capsid has faces consisting of three proteins named VP1-3.
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