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Structure:
- The intact virus is 25nm in diameter and is composed of RNA and 12 capsid pentons (capsomeres), one at each vertex. - Each penton contains 5 subunits. - Each subunit is composed of 1 molecule of VPs 1, 2, 3 and 4. Each virus therefore has 60 molecules of each protein. VP1 protudes for attachment to its heparan sulphate receptor and carries the protective immunogens. |