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The canonical capsid subunit is represented (a) with a quasi-equivalent vertex or ‘centroid’ (that can be either five or six-valent), two non-bisectable straight edges (inter-capsomere edges), and one curved edge that may possess two or more vertices. The subunit may be associated in two quasi-equivalent configurations called capsomeres – comprising five-valent (b) and six-valent (c) clusters.
