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Analysis of empty capsid assembly. (A) Sucrose gradient fractionation of FMDV capsid material analysed by Western blot using A22 serotype antisera with an extract of A22 recombinant virus infectedSf9 cells. Numbers at the top are fractions numbers. Numbers to the left are the migration position of protein markers and are in kilodaltons. (B) Peak fractions from the gradient were analysed by TEM. The bar is 100 nm.
