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(a) Purified particles of maize streak virus stained with uranyl acetate showing typical twinned quasi-isometric subunits. Bar, 50 nm. Reproduced with permission from [1]. (b) Complete atomic model for all 110 subunits in the capsid of Ageratum yellow vein virus, with a polyhedral cage showing the symmetry of the particle. The fivefold symmetry axis is vertical and through the centre of the particle in this view. Bar, 10 nm. CC BY 4.0 licence from [2].
