Capsid facts for kids
Capsids are broadly classified according to their 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 called VP1–3.
The envelope may help viruses avoid the host immune system. Glycoproteins on the surface of the envelope bind to receptor sites on the host's membrane. The viral envelope then fuses with the host's membrane This allows the capsid and viral genome to enter and infect the host.
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Capsid Facts for Kids. Kiddle Encyclopedia.